Diagnostics of the Solar Plasma Using Radio Observations with the RATAN-600

Abstract

ABSTRACT.This paper summarises the methods and main results of studying physical parameters and processes in different structures of the solar atmosphere from the chromosphere to the outer corona as based on the observations with a 600-meter radio telescope the RATAN-600 (1975RATAN-600 ( -1989. Diagnostics of the solar plasma have been made using the spectral-polarization measurements in the wavelength range 0.8-32 cm with high spatial resolution. The most important results concern the structure and strength of the magnetic fields at different levels of the solar atmosphere and detection of localized regions of long-lasting (several days) energy release in the lower corona. INTRODUCTIONSolar observations using the world's largest radio telescopes (VLA, WSRT, RATAN-600 et al. ) have shown during the Solar Maximum Year program that the radio observations yield valuable information about the magnetic fields and particle acceleration in the solar corona. Such diagnostics depend on detailed spectral analysis and accurate polarization measurements with high spatial and temporal resolution. 483-488. SCIENTIFIC PROBLEMS

Magnetic field of solar prominences: The procedure of radio observations

“…The simple formula for the degree of polarization derived by Gelfreikh (1972) is where fH is proportional to the magnetic field. Therefore,…”

“…The polarization observed by the Zeeman effect consists 0.8%, by the Hanle effect 5 2%. The Hanle method gives no way to measure magnetic fields at more than some tens of Gauss because of the total depolarization of lines.The radioastronomical method of magnetic field determination was proposed by Korolkov et al (1958) and developed by Gelfreikh (1972) and Apushkinskij et al (1996). In the presence of a magnetic field the optical depth T for thermal bremsstrahlung is different for extraordinary and ordinary radio waves and depends on the gyrofrequency f H :…”

Scenario of Solar Radio Burst Type III during Solar Eclipse on 14^th November 2012

“…The question of nonlinear wave-wave interaction which involving interaction of electrostatic electron plasma that called as Langmuir waves active region radio emissions also have been studied [6][7][8][9][10]. This wave is a rapid oscillation of the electron density in conducting media such as plasmas or metals.…”

Investigation on a Broken Solar Burst Type II during High Activities in AR1613 on 13th November 2012

“…However, [9] against the theory and strongly agree that Type III [10] burst requires a very strong field to produce a fundamental and second harmonic of gyro frequency. The subject of nonlinear wave-wave interaction which involving interaction of electrostatic electron plasma that called as Langmuir waves active region radio emissions also have been studied [11][12][13][14][15] and the most recent and comprehensive ones can be found in a recent book dedicated to solar and space weather radiophysics [16].…”