Laboratory Reports

2005
Metsähovi Radio Observatory Laboratory Reports 2005 2004 2003 2002 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988
-QUASAR -SUN -VLBI -SPECTROSCOPY -INSTRUMENTATION -MISCELLANEOUS
Urpo, S., Tornikoski, M., Mujunen, A., Oinaskallio, E., Lindfors, T.: Major solar radio flares measured at Metsähovi in 2004. Metsähovi Publications on Radio Science HUT-MET-51, 37 p., 2005.
2004
Urpo, S., Tornikoski, M., Mujunen, A., Oinaskallio, E., Lindfors, T.: Major solar radio flares measured at Metsähovi in 2003. Metsähovi Publications on Radio Science HUT-MET-50, 36 p., 2004.
Urpo, S., Puhakka, P., Mujunen, A., Oinaskallio, E., Tornikoski, M., Lindfors, T., Teräsranta, H.: Aurinkomittausohjeet ja aurinkopurkausten piirto ja kalibrointi Metsähovissa 2004. Metsähovi Reports HUT-KURP-30, 18 p., 2004.
Urpo, S.: Hajatarinoita Kurpitsan historiasta. Metsähovi Reports HUT-KURP-29, 76 p., 2004.
Tornikoski, M., Mujunen, A. (editors): Metsähovi Radio Observatory Annual Report 2003. Metsähovi Reports HUT-KURP-28, 34 p., 2004
2003
Kislyakov, A.G., Stepanov, A.V., Urpo, S., Zaitsev, V.V., Mujunen, A.: Evidences of photosphere five-minute oscillations in solar flare microwave emission Metsähovi Publications on Radio Science, HUT-MET-49, 18 p., 2003.
Ovaska, S., Sjöman, P., Eskelinen, P.: Theoretical susceptibility of Planck 70 GHz radiometer to systematic effects. Metsähovi Publications on Radio Science, HUT-MET-48, 15 p., 2003.
Urpo, S., Puhakka, P., Oinaskallio, E., Mujunen, A., Peltonen, J., Rönnberg, H., Hurtta, S., Tornikoski, M., Teräsranta, H., Könönen, P.: Selected radio maps and major solar radio flares measured at Metsähovi in 2002. Metsähovi Publications on Radio Science, HUT-MET-47, 89 p., 2003.
Urpo, S., Puhakka, P., Oinaskallio, E., Mujunen, A., Peltonen, J., Rönnberg, H., Hurtta, S., Tornikoski, M., Teräsranta, H., Könönen, P.: Selected radio maps and major solar radio flares measured at Metsähovi in 1996-2001. Metsähovi Publications on Radio Science, HUT-MET-46, 78 p., 2003.
Tornikoski, M, Urpo, S. (toim.): Astrofysiikan ratkaisemattomat kysymykset. Metsähovi Publications on Radio Science, HUT-MET-45, 2003.
Urpo, S., Mujunen, A. (editors): Metsähovi Radio Observatory Annual Report 2002. Metsähovi Reports HUT-KURP-26, 33 p., 2003.
Könönen, P.: Monitoring the GPS clock offset at Metsähovi Radio Observatory. Metsähovi Reports HUT-KURP-27, 12 p., 2003.
Zaitsev, V.V., Kislyakov, A.G., Urpo, S., Stepanov, A.V., Shkelev, E.I.: Solar millimeter wave bursts: time-frequency analysis. Metsähovi Publications on Radio Science HUT-MET-44, 15 p., 2003.

2002
Sjöman, P.: Planck 70 GHz LFI, elegant breadboard FEM/BEM receivers. Metsähovi Publications on Radio Science HUT-MET-43, 20 p., 2002.
Wiik, K.: VLBI and total flux density investigations of the structure of active galactic nuclei. Metsähovi Publications on Radio Science HUT-MET-42, 105 p., 2002.
Puhakka, P.: Aurinkoantennin radiopurkausten kalibrointiohjeet. Metsähovi Reports HUT-KURP-25, 11 p., 2002.
Puhakka, P.: Gain measurements of total power radiometer. Metsähovi Publications on Radio-Science HUT-MET-41, 15 p., 2002.
Puhakka, P.: Metsähovin radiotutkimusaseman aurinkoantennin suuntausvirheistä. Metsähovi Publications on Radio-Science HUT-MET-40, 12 p., 2002.
Urpo, S.: Aurinkomittausohjeet Metsähovissa 2002. Metsähovi Reports HUT-KURP-24, 10 p., 2002.
Urpo, S., Mujunen, A.: Metsähovi Radio Observatory Annual Report 2001. Metsähovi Reports HUT-KURP-23, 27 p. 2002.
Greve, A., Könönen, P., Graham, D.A., Wiik, K., Krichbaum, T.P., Conway, J., Rantakyrö, F., Urpo, S., Grewing, M., Booth, R.S., John, D., Navarro, S., Mujunen, A., Ritakari, J., Peltonen, J., Sjöman, P., Berton, M.: 147 GHz VLBI Observations: Detection of Fringes on the 3100 km Baseline Metsähovi - Pico Veleta. Metsähovi Publications on Radio Science HUT-MET-39, 4 p. 2002.
Savolainen, T., Wiik, K., Valtaoja, E., Jorstad, S.G., Marscher, A.P.: Connections Between Millimeter Continuum Variations and VLBI Structure in 27 AGN. Metsähovi Publications on Radio Science HUT-MET-38, 12 p., 2002.
Rantakyrö, F.T., Wiik, K., Tornikoski, M., Valtaoja, E., Bååth, L.B.: Multifrequency Interferometer and Radio Continuum Monitoring Observations of CTA 102. Metsähovi Publications on Radio Science HUT-MET-37, 31 p., 2002.
2001
Zaitsev, V.V., Kislyakov, A.G., Urpo, S., Stepanov, A.V., Shkelev, E.I.: Low-Frequency Modulations in Solar Millimeter Wave Bursts. Metsähovi Publications on Radio Science HUT-MET-36, 18 p., 2001.
Liljeström, T.: Radio Spectroscopic Studies on Cosmic Water Masers. Metsähovi Publications on Radio Science HUT-MET-35, 2001.
Liljeström, T., Gwinn, C.R.: Water Masers Probing Magnetic Pressure and Alfvénic Turbulence in W49N. Metsähovi Publications on Radio Science HUT-MET-34, 30 p., 2001.
Sjöman, P., Hughes, N.: Planck technology 70 GHz Demonstrator Test Report. Metsähovi Publications on Radio Science HUT-MET-33, 26 p., 2001.
Urpo, S., Mujunen, A. (editors): Metsähovi Radio Observatory Annual Report 2000. Metsähovi Reports HUT-KURP-22, 37 p., 2001.

2000
Zaitsev, V.V., Kislyakov, A.G., Urpo, S., Stepanov, A.V., Shkelev, E.I.: The Wigner-Ville analysis of solar microwave emission. Metsähovi Publications on Radio Science HUT-MET-32, 19 p., 2000.
Könönen, P.: ``Efos9@Metsähovi'' - Efos 9 hydrogen maser monitoring system at Metsähovi. Metsähovi Reports HUT-KURP-21,14 p. 2000.
Engelberg, J., Mujunen, A.: EFOS monitoring system - efosd. Metsähovi Reports HUT-KURP-20, 7 p., 2000.
Urpo, S., Mujunen, A. (editors): Metsähovi Radio Observatory Annual Report 1999. Metsähovi Reports HUT-KURP-19, 35 p., 2000.
Könönen, P.: ``Weather@Metsähovi'' - Weather Monitoring System at Metsähovi. Metsähovi Reports HUT-KURP-18, 13 p., 2000.
Vilenius, E., Könönen, P.: Calibration of the "GroWeather" weather stations at Metsähovi. Metsähovi Reports HUT-KURP-17, 18 p., 2000.
Engelberg, J., Mujunen, A., Oinaskallio, E.: Radio Spectrum Monitoring System - spektrd. Metsähovi Reports HUT-KURP-16, 8 p., 2000.

1999
Lähteenmäki, A.: Total flux density variations in extragalactic radio sources: Observations and analysis. Metsähovi Publications on Radio Science HUT-MET-31, 33 p, 1999.
Urpo, S., Mujunen, A. (editors): Metsähovi Radio Observatory Annual Report 1998. Metsähovi Reports HUT-KURP-15, 43 p., 1999.
Zaitsev, V.V., Urpo, S., Stepanov, A.V.: Radiation signatures of solar energy release at mm-wavelengths: advanced circuit model. Metsähovi Publications on Radio Science HUT-MET-30, 15 p., 1999.
Zaitsev, V.V., Urpo, S., Stepanov, A.V.: Dynamics of energy release in single flare loop. Metsähovi Publications on Radio Science HUT-MET-29 16 p., 1999.
Lähteenmäki, A., Valtaoja, E.: Total flux density variations in extragalactic radio sources. III. Doppler boosting factors, Lorenz factors and viewing angles for active galactic nuclei. Metsähovi Publications on Radio Science HUT-MET-28, 23 p., 1999.

1998
Pohjolainen, S.: CESRA Workshop on Coronal Explosive Events. Metsähovi Publications on Radio Science HUT-MET-27, 90 p., 1998.
Mujunen A., Perttula M., Engelberg J.: Using CVS at Metsähovi. Metsähovi Reports HUT-KURP-14, 13 p., 1998.
Pohjolainen, S. (editor): Metsähovi Radio Observatory Annual Report 1997. Metsähovi Reports, HUT-KURP-13, 1998.

1997
URPO, S., POHJOLAINEN S., HEIKKILÄ J., WIIK K.: Solar observations at Metsähovi in 1994-1995. Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 26, 1997.
ZAITSEV, V.V., STEPANOV, A.V., URPO, S., POHJOLAINEN, S.: LRC-circuit analog of current carrying magnetic loop: Dagnostics of electric parameters. Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 25, 1997.
URPO S (editor): Metsähovi Radio Research Station Annual Report 1996; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 12, 54 p, 1997.

1996
URPO S (editor): Metsähovi Radio Research Station Annual Report 1995; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 11, 40 p, 1996.
POHJOLAINEN S, VALTAOJA E, URPO S, AURASS H: Microwave emission from coronal heights: study of a non-thermal radio flare; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 21, 23 p, 1996.
RIEHOKAINEN A, URPO S, VALTAOJA E: Solar rotation rates at high latitudes determined from microwave observations; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 22, 6 p, 1996.
RIEHOKAINEN A, URPO S, VALTAOJA E: The relationship between enhanced temperature microwave regions and other solar activity at low and high latitudes; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 23, 6 p, 1996.
POHJOLAINEN S: Energy release by solar flares: Observations at radio and X-ray wavelengths; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 24, 113 p, 1996.
URPO S (editor): Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä, Finland; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 90 p, in press, 1996.
STEPANOV A V, TSAP Yu T, URPO S, ZAITSEV V V: Equivalent LRC-circuit for flare energy release volume; Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä, Finland; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 15 p, in press, 1996.
URPO S: Classification of solar radio bursts measured at Metsähovi in 1988-1992; Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä, Finland; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 10 p, in press, 1996.
VALTAOJA E: Classification of active galactic nuclei; Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä; Finland, Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 9 p, in press, 1996.
LEPPÄNEN K: Construction of VLBA terminal at Helsinki University of Technology; Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä, Finland; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 4 p, in press, 1996.
LÄHTEENMÄKI A: A complete 2Jy sample of quasars for high resolution VLBI observations; Proceedings of the I Finnish - CIS Symposium on Radio Astronomy, 11-12.2.1992 Sodankylä, Finland; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 18, 3 p, in press, 1996.

1995
URPO S (editor): Metsähovi Radio Research Station Annual Report 1994; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 10, 35 p, 1995.
LEPPÄNEN K: 22 GHz Polarimetric Imaging with the Very Long Baseline Array; Thesis for Doctor of Technology, Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 20, 197 p, 1995.
MUJUNEN A: Mark IV Read/Write Electronics Upgrade; Metsähovi Internal Report, 34 p, 1995.
MUJUNEN A: Installing the Mark IV Read/Write Electronics Upgrade; Metsähovi Internal Report, 10 p, 1995.

1994
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar Observations at Metsähovi in 1993; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 16, 95 p, 1994.
TORNIKOSKI M: Studies of extragalactic radio sources: observations and analysis of multifrequency spectra and variability; Thesis for Doctor of Technology, February 1994, Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 17, 212 p, 1994.
URPO S (editor): Metsähovi Radio Research Station Annual Report 1993; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 9, 40 p, 1994.
TERÄSRANTA H: Observations of extragalactic sources with the Metsähovi radio telescope at 22-87 GHz; Thesis for Doctor of Technology, April 1994, Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 19, 29 p, 1994.
WIIK K: Radio telescope surface error measurement using microwave metrology; Helsinki University of Technology, Faculty of Electrical Engineering, Master´s thesis, May 1994.

1993
TORNIKOSKI M: Radioastronomical measurements (in Finnish); in Laboratory Exercises in Space Technology; J. Putkonen (editor), Helsinki University of Technology, Laboratory of Space Technology, Report A12, pp V-1 - V-24, January 1993.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar Observations at Metsähovi in July - December 1992; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 13, 48 p, 1993.
URPO S (editor): Metsähovi Radio Research Station Annual Report 1992; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 7, 32 p, 1993.
URPO S, VALTAOJA E (editors): New dimensions of space research and radio science (in Finnish); Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 8, 148 p, 1993.
POHJOLAINEN S, LEHTINEN K (editors): Finnish astronomy days 1992 and 1993, Proceedings of the Finnish Astronomical Society, Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 14, 20 p, 1993.
MUJUNEN A: Controlling the VLBA Field System; New dimensions of space research and radio science, S. Urpo and E. Valtaoja (eds.), Metsähovi Radio Research Station, Series B, Report 8, pp 17-49, 1993
POHJOLAINEN S: The use of solar eclipses in solar research (in Finnish); New dimensions of space research and radio science, S. Urpo and E. Valtaoja (eds.), Metsähovi Radio Research Station, Series B, Report 8, pp 74-84, 1993.
TORNIKOSKI M: Gravitational lenses (in Finnish); New dimensions of space research and radio science, S. Urpo and E. Valtaoja (eds.), Metsähovi Radio Research Station, Series B, Report 8, pp 125-137, 1993.
WIIK K: Millimeter- and submillimeter-VLBI (in Finnish); New dimensions of space research and radio science, S. Urpo and E. Valtaoja (eds.), Metsähovi Radio Research Station, Series B, Report 8, pp 138-148, 1993.
TORNIKOSKI M, VALTAOJA E, TERÄSRANTA H, SMITH A G, NAIR A D, CLEMENTS S D, LEACOCK R J: Correlated radio and optical variations in a sample of AGN; Metsähovi Radio Research Station, Series A , Report 15, 25 p, 1993.
TORNIKOSKI M, VALTAOJA E, TERÄSRANTA H, OKYUDO M: A simultaneous radio-optical flare in BL Lacertae; Metsähovi Radio Research Station, Series A, Report 15, 3 p, 1993.
RITAKARI J: Experiences in Constructing the VLBA Baseband Converters; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 35-36, 1993.
WIIK K: Microwave metrology of large reflector antennas; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 45-46, 1993.
POHJOLAINEN S, URPO S: Solar radio radiation and burst analysis; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 47-48, 1993.
TORNIKOSKI M: Simultaneity of radio and optical flares in extragalactic radio sources; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 49-50, 1993.
MUJUNEN A: Controlling VLBI station equipment; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 51-52, 1993.
PELTONEN J K: 22 GHz VLBI receiver; XIX Convention on Radio Science, 25.-26.10.1993, Abstracts of papers, V. Porra and P. Alinikula (eds.), Electronic Circuit Design Laboratory, Report 21, pp 67-68, 1993.
LEPPÄNEN K: Opacity correction for high frequency VLBI observations; NRAO VLBA scientific Memorandum No 1, 20 p, 1993.

1992
LEPPÄNEN K: Development of the VLBI system of Metsähovi Radio Research Station; Helsinki University of Technology, Faculty of Electrical Engineering, Master´s thesis, 86 p, January 1992.
LEPPÄNEN K: Gravitational lenses (in Finnish); in Theoretical background of everyday light phenomena; A. Sihvola (editor), Helsinki University of Technology, Laboratory of Electromagnetism Report SF 14, pp 81-87, 1992.
TERVONEN J: Optical activity (in Finnish); in Theoretical background of everyday light phenomena; A. Sihvola (editor), Helsinki University of Technology, Laboratory of Electromagnetism Report SF 14, pp 207-220, 1992.
TORNIKOSKI M: Haloes (in Finnish); in Theoretical background of everyday light phenomena; A. Sihvola (editor), Helsinki University of Technology, Laboratory of Electromagnetism Report SF 14, pp 221-248, 1992.
WIIK K: Auroral lights (in Finnish); in Theoretical background of everyday light phenomena; A. Sihvola (editor), Helsinki University of Technology, Laboratory of Electromagnetism Report SF 14, pp 249-273, 1992.
URPO S (editor): Metsähovi Radio Research Station Annual Report 1991; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 6, 38 p, 1992.
URPO S, KARLAMAA K, POHJOLAINEN S, TERÄSRANTA H: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1991; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 10, 122 p, 1992.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar radio flares 1989-1991, Solar microwave flares observed at Metsähovi Radio Research Station in 1989-1991; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 11, 119 p, 1992.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar observations at Metsähovi in January-June 1992; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 12, 65 p, 1992.
VDOVIN V, DRYAGIN Yu, PELTONEN J: The cryogenically cooled 3-mm receiver with beam-lead Schottky-barrier mixer; Preprint of the Institute of Applied Physics, Nizhny Novgorod, 1992.
MUJUNEN A: Applying ER modelling and data dictionary techniques in software production automation; Helsinki University of Technology, Faculty of Electrical Engineering, Master´s thesis, May 1992.
TERVONEN J: Development of the polarisation measurement system for the Metsähovi Radio Research Station; Helsinki University of Technology, Faculty of Electrical Engineering, Master´s thesis, June 1992.

1991
TERÄSRANTA H: Study of solar long period oscillations with the Metsähovi radio telescope; Licentiate Thesis, Helsinki University of Technology, Department of Electrical Engineering, 1991.
URPO S (editor):Metsähovi Radio Research Station Annual Report 1990; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 5, 31 p, 1991.
URPO S, POHJOLAINEN S, TERÄSRANTA H, KARLAMAA K: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1987-1988; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 5, 70 p, 1991.
URPO S, POHJOLAINEN S, TERÄSRANTA H, KARLAMAA K: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1989; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 6, 48 p, 1991.
URPO S, POHJOLAINEN S, TERÄSRANTA H, KARLAMAA K: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1990; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 7, 123 p, 1991.

1990
URPO S, POHJOLAINEN S (editors): Metsähovi Radio Research Station Annual Report 1989; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 4, 25p, 1990.
PELTONEN J: Development of components and subsystems for low noise receivers at micro- and millimeter waves; Report S 187, Thesis for Doctor of Technology, September 1990, Helsinki University of Technology, Radio Laboratory, 1990.
TORNIKOSKI M: A program for solar activity research at microwave wavelengths; Helsinki University of Technology, Thesis for diploma Engineer, 68p, 1990.

1989
URPO S, POHJOLAINEN S (editors): Metsähovi Radio Research Station Annual Report 1988; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 1, 11 p, 1989.
URPO S, TERÄSRANTA H, KRÜGER A, HILDEBRANDT J, RUZDJAK V: On the connection of solar coronal millimeter wave sources with gradual bursts in the centimetre range; Akademie der Wissenschaften der DDR, Zentralinstitut für Astrophysik, Potsdam-Babelsberg, PRE.ZIAP 89-03, 23 p, 1989.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1984-1986; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 4, 60 p, 1989.
WÄYRYNEN V: Solar observation system. Program Document Vol I-II; Helsinki Univeristy of Technology, Metsähovi Radio Research Station, Series B, Report 2, 1989.
LAURILA H, HOLSTI N, TERÄSRANTA H, URPO S, JANKKO T: A computer program for point-source microwave continuum observation (FIVE) program document, Vol I User´s manual; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 3, 133 p, 1989.
LAURILA H, HOLSTI N, TERÄSRANTA H, URPO S, JANKKO T: A computer program for point-source microwave continuum observation (FIVE) program document, Vol II system description manual; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 3, 100 p, 1989.
LAURILA H, HOLSTI N, TERÄSRANTA H, URPO S, JANKKO T: A computer program for point-source microwave continuum observation (FIVE) program document, Vol III Program source code listings; Helsinki University of Technology, Metsähovi Radio Research Station, Series B, Report 3, 133 p, 1989.
AVERIANIKHINA E A, AURASS H, URPO S: The radio precursors of the flare events 06 June 1980 and 17 July 1982; Akademie der Wissenschaften der DDR, Zentralinstitut für Astrophysik, Potsdam-Babelsberg, PRE-ZIAP 89-19, 8 p, 1989.

1988
URPO S: Finland in international space organizations (in Finnish); in seminar publication: Avaruustutkimuksen näkymiä edited by Markus Hotakainen, University of Helsinki, Department of Astrophysics, pp 39-40, 1988.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1980-1981; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 2, 108 p, 1988.
URPO S, POHJOLAINEN S, TERÄSRANTA H: Solar microwave radiation maps measured at Metsähovi Radio Research Station in 1982-1983; Helsinki University of Technology, Metsähovi Radio Research Station, Series A, Report 3, 92 p, 1988.