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 Current helicity and magnetic field anisotropy in solar active regions

2015 ◽  
Vol 454 (2) ◽  
pp. 1921-1930 ◽  
Author(s):  
H. Xu ◽  
R. Stepanov ◽  
K. Kuzanyan ◽  
D. Sokoloff ◽  
H. Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Active Regions ◽  
Solar Active Regions ◽  
Current Helicity

scholarly journals Statistical distribution of current helicity in solar active regions over the magnetic cycle

2013 ◽  
Vol 433 (2) ◽  
pp. 1648-1658 ◽  
Author(s):  
Y. Gao ◽  
T. Sakurai ◽  
H. Zhang ◽  
K. M. Kuzanyan ◽  
D. Sokoloff
Keyword(s):  
Active Regions ◽  
Statistical Distribution ◽  
Magnetic Cycle ◽  
Solar Active Regions ◽  
Current Helicity

scholarly journals Flare Occurrence in the Solar Active Regions with Reversed Helicity Sign

2001 ◽  
Vol 203 ◽  
pp. 247-250
Author(s):  
S. D. Bao ◽  
G. X. Ai ◽  
H. Q. Zhang
Keyword(s):  
Solar Cycle ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Relative Number ◽  
Active Regions ◽  
Flare Activity ◽  
Sunspot Maximum ◽  
Solar Active Regions ◽  
Current Helicity

Based on the Huairou Solar Observing Station dataset, we computed the current helicity for several hundreds of active regions and found that: (1) Active regions that do not follow the hemispheric helicity sign rule show more flare activity than normal active regions. (2) The relative number of active regions with reversed helicity sign is higher near sunspot maximum. (3) It appears that during solar cycle 22 the southern hemisphere has more the reversed-sign active regions and stronger flare activity than the northern hemisphere.

scholarly journals Estimates of Current Helicity and Tilt of Solar Active Regions and Joy’s Law

2020 ◽  
Vol 60 (8) ◽  
pp. 1032-1037
Author(s):  
K. Kuzanyan ◽  
N. Kleeorin ◽  
I. Rogachevskii ◽  
D. Sokoloff ◽  
H. Zhang
Keyword(s):  
Active Regions ◽  
Solar Active Regions ◽  
Current Helicity

scholarly journals Soft X-ray Flares and Magnetic Configuration in Solar Active regions

2001 ◽  
Vol 203 ◽  
pp. 237-240
Author(s):  
H. Zhang
Keyword(s):  
Active Regions ◽  
Magnetic Configuration ◽  
X Ray ◽  
Vector Magnetograms ◽  
Solar Active Regions ◽  
The Relationship ◽  
Current Helicity

In this paper, we analyze the soft X-ray flares and the relationship with photospheric vector magnetograms and current helicity in 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.

The Hemispheric Sign Rule of Current Helicity during the Rising Phase of Cycle 23

2000 ◽  
Vol 179 ◽  
pp. 303-306
Author(s):  
S. D. Bao ◽  
G. X. Ai ◽  
H. Q. Zhang
Keyword(s):  
Solar Cycle ◽  
Southern Hemisphere ◽  
Northern Hemisphere ◽  
Active Regions ◽  
Hemispheric Preference ◽  
Current Helicity

AbstractWe compute the signs of two different current helicity parameters (i.e., αbestandHc) for 87 active regions during the rise of cycle 23. The results indicate that 59% of the active regions in the northern hemisphere have negative αbestand 65% in the southern hemisphere have positive. This is consistent with that of the cycle 22. However, the helicity parameterHcshows a weaker opposite hemispheric preference in the new solar cycle. Possible reasons are discussed.

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
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