Adiabatic spectrum of radio emission of plasma clouds, emitted by the Sun during solar flares, and inhomogeneities of the spectrum of radio emission of clouds

Cover Page

Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

Abstract

It is known that so-called solar flares systematically occur in the area of sunspots. They are accompanied by radiation in almost all frequency ranges and sometimes by the emission of hot plasma. Observations on the RATAN-600 radio telescope have shown that the radio emission spectrum of plasma clouds heated to values of the order of 10K erupted from the solar flare region turned out to be adiabatic. The high correlation of the inhomogeneities of the radio emission spectra of active formation over a group of sunspots indicates the stable presence of recombination radio lines in the radiation of active formation. However, the radio emission spectra of hot plasma clouds ejected from the region of solar flares occurring in this group of spots do not show any correlation.

Full Text

Restricted Access

About the authors

А. F. Dravskikh

Special Astrophysical Observatory of the Russian Academy of Sciences

Author for correspondence.
Email: dedalfed@mail.ru

St. Petersburg Branch

Russian Federation, St. Petersburg

Yu. A. Dravskikh

Special Astrophysical Observatory of the Russian Academy of Sciences

Email: dedalfed@mail.ru

St. Petersburg Branch

Russian Federation, St. Petersburg

References

  1. С.И. Сыроватский, Токовые слои и вспышечные процессы в лабораторной и космической плазме (УФН 118 738–741, 1976).
  2. E.R. Priest and T. Forbes, Magnetic Reconnection. MHD Theory and Applications (Cambridge Univ. Press, Cambridge, 2000).
  3. А.Б. Северный, Н.Н. Степанян, Солнечные вспышки (М., 1976).
  4. В.М. Томозов, В.Н. Цытович, Взрывные процессы на Солнце (Знание, М., т. 56, 1979).
  5. А.Т. Алтынцев, В.Г. Банин, Г.В. Куклин, В.М. Томозов, Солнечные вспышки (Наука, М., 1982).
  6. Л.И. Мирошниченко, Физика Солнца и солнечно-земных связей. Учебное пособие (Университетская книга, М., 2011).
  7. Э. Паркер, Солнечный ветер, УФН, Физика наших дней, т. LXXXIV, вып. 1 (1964).
  8. E.N. Parker, The Solar Wind, Scient. American 210 (4), 66 (1964).
  9. В.М. Богод, А.М. Алесин, А.А. Перваков, Астрофиз. бюлл. 66, 2 (2011).
  10. А.Ф. Дравских, Ю.А. Дравских, Астрон. журн. 100, 472 (2023).
  11. А.Ф. Дравских, Ю.А. Дравских, Астрон. журн. 99, 496 (2022).
  12. Лаборатория солнечной астрономии ИКИ и ИСЗФ РАН (Лаборатория рентгеновской астрономии Солнца Института космических исследований (ИКИ) РАН и Института солнечно-земной физики (ИСЗФ) Сибирского отделения РАН).

Supplementary files

Supplementary Files
Action
1. JATS XML
2. Fig. 1. Sunspot groups of 06.09.2017 and the corresponding AO. Group 12673 is highlighted.

Download (52KB)
3. Fig. 2. Scan of the Sun on the RAAN-600 radio telescope at azimuth 0° for 06.09.2017.

Download (36KB)
4. Fig. 3. Changes in the intensity at the maximum of the spectrum of AO12673 according to RT observations at azimuth 0° for the entire period of AO’s stay on the visible side of the Sun from August 30 to September 9, 2017.

Download (27KB)
5. Fig. 4. Spectra at the emission maxima of AO 12673 during solar observations on September 6, 2017 at azimuths of –24°, –12°, 0°, +12°, +24°.

Download (34KB)
6. Fig. 5. Radio emission intensity AO12673 09/07/2017 in azimuths.

Download (33KB)
7. Fig. 6. Radio emission intensity AO12673 09/08/2017 in azimuths.

Download (32KB)
8. Fig. 7. Radio emission spectra of AO12673 for September 6, 2017 in azimuths of –12° and +12°, approximated by 5th degree polynomials. Polynomials and approximation reliability values ​​R2 are given.

Download (42KB)
9. Fig. 8. Inhomogeneities of the radio emission spectra of AO12673 for September 6, 2017 in azimuths of –12° and +12°. Their correlation coefficient is 0.92.

Download (33KB)
10. Fig. 9. Inhomogeneities of the radio emission spectra of the cloud and AO for September 6, 2017 at an azimuth of –12° as a percentage of the intensities of the cloud and AO.

Download (35KB)
11. Fig. 10. Spectra at the emission maxima of AO 12673 during solar observations on September 7, 2017, at azimuths from –30° to +30°.

Download (36KB)
12. Fig. 11. Inhomogeneities of the radio emission spectra of coronal plasma clouds ejected from solar flare regions on September 6 and 7, 2017, as a percentage of the cloud emission intensities, their CC = –0.01982, their intensities are equal to 7.58684 and 22.86702%, respectively.

Download (38KB)

Copyright (c) 2024 The Russian Academy of Sciences