Flare-associated variations in the spectral slope of radio emission (??3 cm) from solar active regions

1979 ◽  
Vol 22 (10) ◽  
pp. 803-811 ◽  
Author(s):  
S. I. Arbuzov
Keyword(s):  
Radio Emission ◽  
Active Regions ◽  
Spectral Slope ◽  
Solar Active Regions

Peculiarities of polarized radio emission of solar active regions

2011 ◽  
Vol 55 (1) ◽  
pp. 82-90 ◽  
Author(s):  
L. V. Yasnov ◽  
T. I. Kal’tman ◽  
V. M. Bogod
Keyword(s):  
Radio Emission ◽  
Active Regions ◽  
Solar Active Regions

Polarization of Microwave Radio Emission of Flare-Producing Solar Active Regions

Solar Physics ◽  
2009 ◽  
Vol 255 (2) ◽  
pp. 253-271 ◽  
Author(s):  
Vladimir M. Bogod ◽  
Leonid V. Yasnov
Keyword(s):  
Radio Emission ◽  
Active Regions ◽  
Microwave Radio ◽  
Solar Active Regions

Long-term oscillations in solar active regions based on magnetic fields and radio emission

2013 ◽  
Vol 57 (8) ◽  
pp. 636-640 ◽  
Author(s):  
Yu. A. Nagovitsyn ◽  
E. Yu. Nagovitsyna ◽  
V. E. Abramov-Maximov
Keyword(s):  
Magnetic Fields ◽  
Radio Emission ◽  
Active Regions ◽  
Solar Active Regions

Thermal Cyclotron Radiation from Solar Active Regions

1980 ◽  
Vol 86 ◽  
pp. 87-99
Author(s):  
V.V. Zheleznyakov ◽  
E. Ya. Zlotnik
Keyword(s):  
Fine Structure ◽  
Radio Emission ◽  
Frequency Spectrum ◽  
Solar Radio ◽  
Active Regions ◽  
Solar Radio Emission ◽  
Kinetic Temperature ◽  
Frequency Spectra ◽  
Solar Active Regions ◽  
Thermal Cyclotron Radiation

Various frequency spectra with the fine structure resulting from the thermal cyclotron radio emission from solar active regions are discussed. The conditions in sources (distribution of magnetic field and kinetic temperature over the height) are put forward which provide the frequency spectrum as a set of cyclotron lines and high frequency cut-offs. For each kind of distribution the frequency spectrum and polarization are of peculiar character. This permits one to find the conditions in the source through the properties of the observed microwave solar radio emission. To obtain reliable data on the fine structure and judge about conditions in the sources it is necessary to study microwave solar radio emission using the swept-frequency or multi-channel receivers combined with high directional antennae.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

On the nature of microwave pulsations from solar active regions

2003 ◽  
Vol 8 (5-6) ◽  
pp. 136-139
Author(s):  
G.B. Gelfreikh ◽  
◽  
Y.T. Tsap ◽  
Y.G. Kopylova ◽  
L.I. Tsvetkov ◽  
...  
Keyword(s):  
Active Regions ◽  
Solar Active Regions

A Study of the Evolution of Solar Active Regions for Improving Solar Flare Forecasts

1989 ◽  
Author(s):  
Patricia L. Bornmann ◽  
Darren Kalmbach ◽  
David Kulhanek ◽  
April Casale
Keyword(s):  
Solar Flare ◽  
Active Regions ◽  
Solar Active Regions
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