Implementing a Magnetic Charge Topology Model for Solar Active Regions

2005 ◽  
Vol 629 (1) ◽  
pp. 561-571 ◽  
Author(s):  
G. Barnes ◽  
D. W. Longcope ◽  
K. D. Leka
Keyword(s):  
Magnetic Charge ◽  
Active Regions ◽  
Solar Active Regions ◽  
Topology Model ◽  
Charge Topology

scholarly journals Statistical Properties of Magnetic Separators in Model Active Regions

2000 ◽  
Vol 195 ◽  
pp. 443-444
Author(s):  
B. T. Welsch ◽  
D. W. Longcope
Keyword(s):  
Active Region ◽  
Solar Corona ◽  
Magnetic Reconnection ◽  
First Principles ◽  
Magnetic Charge ◽  
Active Regions ◽  
Heating Rates ◽  
X Ray ◽  
Field Lines ◽  
Charge Topology

“Transient brightenings” (or “microflares”) regularly deposit 1027 ergs of energy in the solar corona, and account for perhaps 20% of the active corona's power (Shimizu 1995). We assume these events correspond to episodes of magnetic reconnection along magnetic separators in the solar corona. Using the techniques of magnetic charge topology, we model active region fields as arising from normally distributed collections of “magnetic charges”, point-like sources/sinks of flux (or field lines). Here, we present statistically determined separator (X-ray loop) lengths, derived from first principles. We are in the process of statistical calculations of heating rates due to reconnection events along many separators.

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

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

scholarly journals A Statistical Study of Solar Active Regions That Produce Extremely Fast Coronal Mass Ejections

2008 ◽  
Vol 680 (2) ◽  
pp. 1516-1522 ◽  
Author(s):  
Yuming Wang ◽  
Jie Zhang
Keyword(s):  
Coronal Mass Ejections ◽  
Statistical Study ◽  
Active Regions ◽  
Solar Active Regions
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