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

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

State variables for solar active regions

2003 ◽  
Vol 22 (1) ◽  
pp. 75-79
Author(s):  
S. Krasotkin ◽  
O. Chumak ◽  
E. Kononovich
Keyword(s):  
Active Regions ◽  
State Variables ◽  
Solar Active Regions

Variations of microwave emission from solar active regions

2004 ◽  
Vol 30 (7) ◽  
pp. 489-495 ◽  
Author(s):  
G. B. Gelfreikh ◽  
Yu. T. Tsap ◽  
Yu. G. Kopylova ◽  
T. B. Goldvarg ◽  
Yu. A. Nagovitsyn ◽  
...  
Keyword(s):  
Active Regions ◽  
Microwave Emission ◽  
Solar Active Regions

scholarly journals Intermittency spectra of current helicity in solar active regions

2018 ◽  
Vol 480 (3) ◽  
pp. 3780-3787 ◽  
Author(s):  
A S Kutsenko ◽  
V I Abramenko ◽  
K M Kuzanyan ◽  
Haiqing Xu ◽  
Hongqi Zhang
Keyword(s):  
Active Regions ◽  
Solar Active Regions ◽  
Current Helicity

Microwave radiation of solar active regions before X flares according to the RATAN-600 observations in 2011

2013 ◽  
Vol 53 (8) ◽  
pp. 989-996 ◽  
Author(s):  
V. E. Abramov-Maximov ◽  
V. N. Borovik ◽  
L. V. Opeikina
Keyword(s):  
Microwave Radiation ◽  
Active Regions ◽  
Solar Active Regions

scholarly journals Evidence for Open Field Lines from Active Regions: Short Communication

1980 ◽  
Vol 91 ◽  
pp. 261-261
Author(s):  
K. V. Sheridan
Keyword(s):  
Open Field ◽  
Subject Matter ◽  
Short Communication ◽  
Active Regions ◽  
Theoretical Physics ◽  
University Of Colorado ◽  
Solar Active Regions ◽  
The Subject ◽  
Field Lines ◽  
Sydney Australia

A paper that has considerable relevance of the subject matter of this symposium is the following: “Evidence for Extreme Divergence of Open Field Lines from Solar Active Regions,” by G. A. Dulk (Division of Radiophysics, CSIRO, Sydney, Australia and Department of Astro-Geophysics, University of Colorado, Boulder, Colorado), D. B. Melrose (Department of Theoretical Physics, University of Sydney, Australia) and S. Suzuki (Division of Radiophysics, CSIRO, Sydney, Australia).

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