--- Description of the data file - solar total intensity at 11.2 GHz ---

Detailed technical description of the instrument can be found from: http://metsahovi.aalto.fi/en/research/sun/
and
Reliability of 1.8-meter solar radio telescope at Metsahovi Radio Observatory for long-term solar monitoring, Uunila, Minttu; Kallunki, Juha, Astrophysics and Space Science, Volume 359, article id.33, 6 pp, 2015.

--- Data file format

	Time 			Data scale		Voltage (V)
	201608290001349995	Lin			0.6827
	201608290001349995	Log			2.2199

Time format: 201608290001349995 (year-month-day-hour-minute-second-microsecond)

Data is averaged at 0,1 Hz. Data with higher sampling rate (up to 1 kHz) is also available. Please contact to Juha Kallunki (email: juha.kallunki@aalto.fi) to get the data.

--- Logarithmic-to-Linear-scale conversion

The logarithmic voltage scale can be converted to linear voltage scale with following conversion function:

#voltage_lin = 1.0333 x voltage_log^3 - 6.2661 x voltage_log^2 + 13.34 x voltage_log - 9.2888
Update, 24.4.2017: voltage_lin = 0.4032 x voltage_log^3 - 1.515 x voltage_log^2 + 0.8912 x voltage_log + 1.451

--- Voltage-to-SFU-conversion

The description of the voltage scale to SFU-conversion is presented in 

Reliability of 1.8-meter solar radio telescope at Metsahovi Radio Observatory for long-term solar monitoring, Uunila, Minttu; Kallunki, Juha, Astrophysics and Space Science, Volume 359, article id.33, 6 pp, 2015.

The calibration is carried out daily at 09:00 (summertime) or 10:00 (wintertime). Times are in UT.

The effect of calibration diode as in Kelvins is 770 K (before 2017-05-16: 486 K). The factor of the power pattern of the beam is 0.95.

All the other information can be found from the reference.

--- Data access

Data access is free for everybody but we would appreciate credit to Aalto University, Metsahovi Radio Observatory.

In all papers where any kind of data from the Metsahovi Radio Observatory (MRO) has been used, the MRO is to be acknowledged. Examples for use are given below.
 
Example 1, in text:
These data are obtained at the Metsahovi Radio Observatory, operated by the Aalto University in Finland.
 
Example 2, in text:
Based on observations obtained at the Metsahovi Radio Observatory, operated by the Aalto University in Finland, ...
 
Example 3: in acknowledgment
This publication makes use of data obtained at the Metsahovi Radio Observatory, operated by the Aalto University.

Updated: 17.5.2017 / Juha Kallunki (email: juha.kallunki@aalto.fi)