Solar corona heating and microwave variations

1Gelfreikh, GB, 2Goldvarg, TB, 1Kopylova, Yu.G, 1Nagovitsin, YA, 3Tsap, YT, 3Tsvetkov, LI
1Main Astronomical Observatory of the Russian Academy of Sciences, St. Petersburg, Russia
2B.B. Gorodovikova Kalmyk State University, Elista, Republic of Kalmykia, Russia
3Scientific-Research Institute «Crimean Astrophysical Observatory» of the Ministry for Education and Science of Ukraine, Nauchny, Crimea, Ukraine
Kosm. nauka tehnol. 2002, 8 ;(Supplement2):243-247
Publication Language: Russian
Based on observational data obtained in September 2001 using RT-22 CrAO on frequency channels 8.6 and 15.4 GHz, quasi-periodic variations of microwave radiation from active regions of the Sun with periods T<10 min are investigated using wavelet analysis. It was found that oscillations with T≈3 min have the largest amplitude, while quasiperiodic variations with T<10 s were suppressed. Oscillations of radiation with T=10 ... 40 s, which are associated with disturbances of the Alfven type in the upper atmosphere of the Sun, are detected.
1. Nindos A., Alissandrakis C. E., Gelfreikh G. B., et al. In: Astron. Astrophys., 386, 658–673 (2002).
2. De Pontieu, Martens P. C., Hudson H. S. In: Astrophys. J., 558, 859–871 (2001).

3. Gordon B. E., Hollweg J. V. In: Astrophys. J., 266, 373–382 (1983).