The flux of radio emission from the Sun with a wavelength of 10.7 cm (2800 MHz)
After the discovery of the radio emission of the Sun in 1947, a new index of solar activity was introduced -
flux of radio emission F 10.7 with a wavelength of 10.7 cm (2800 MHz).
It is measured in solar flux units: 1 sfu = 10-22W/(m2·Hz).
If during the observations there is a burst of radio emission from the sun, then part of the radiation flux,
associated with the splash, is subtracted. This index characterizes changes in temperature and density
on the entire visible disk of the Sun. Its changes correlate well with changes in Wolf numbers and
of the total area of spots and is a convenient daily characteristic of solar activity.
The values of the radio emission flux F10.7
for the period from 1947 to the present:
Data are presented in three forms:
| – Daily values of the radio flux of the Sun:
1947–2014 – annual tables
DAILY_PLT – daily data
in format suitable for graphical representation
| – Monthly values of the radio flux of the Sun:
MONTHLY – table
MONTHLY_PLT – in format suitable for graphical representation
| – Annual values of the radio flux of the Sun:
YEARLY – table
YEARLY_PLT – in format suitable for graphical representation
obs – observed values measured by the solar radio telescope;
adj – adjusted values corrected for the change in Earth-Sun distance
and reduced to the mean distance;
abs – absolute values - adjusted values multiplied by 0.9.