scholarly journals Reconstruction of the Coronal Magnetic Field for Active Region NOAA 8151

2001 ◽  
Vol 203 ◽  
pp. 441-443
Author(s):  
S. Régnier ◽  
T. Amari
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Magnetic Energy ◽  
Coronal Magnetic Field ◽  
X Rays ◽  
Active Region Noaa ◽  
Filament Eruption ◽  
Linear Force ◽  
Region Noaa ◽  
Field Lines

The active region NOAA 8151 observed between February 11–13, 1998 exhibits a filament eruption linked to the disappearance of a sigmoidal structure. Using vector magnetograms from IVM (Mees Observatory, Hawaii), we perform a non linear force-free reconstruction of the coronal magnetic field above this active region. This reconstruction allows to determine the distribution of electric currents, the magnetic energy and the relative magnetic helicity. The reconstructed magnetic field lines are compared to the soft X-rays (SXT, Yohkoh) observations.

scholarly journals TWIST AND CONNECTIVITY OF MAGNETIC FIELD LINES IN THE SOLAR ACTIVE REGION NOAA 10930

2011 ◽  
Vol 738 (2) ◽  
pp. 161 ◽  
Author(s):  
S. Inoue ◽  
K. Kusano ◽  
T. Magara ◽  
D. Shiota ◽  
T. T. Yamamoto
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Solar Active Region ◽  
Active Region Noaa ◽  
Region Noaa ◽  
Field Lines

scholarly journals Coordinate flares observed by TRACE

2012 ◽  
Vol 8 (S294) ◽  
pp. 547-548
Author(s):  
Defang Kong ◽  
Xiaoli Yan ◽  
Zhike Xue
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Potential Fields ◽  
Active Region Noaa ◽  
Clockwise Rotation ◽  
X Ray ◽  
Region Noaa ◽  
Field Lines ◽  
Rotation Motion

AbstractTwo flares occurred simultaneously in active region NOAA 9433 on 2001 April 25. The GOES X-ray fluxes show only one peak during the two flares. The negative magnetic polarities in the two flaring regions exhibited a clockwise rotation motion around the positive polarities, which can be seen from the evolution of the SOHO/MDI magnetograms. Through analyzing the potential fields extrapolated from the MDI magnetogram, we find that there is a channel strode by a group of magnetic field lines connecting the two flaring regions.

A Rapidly Evolving Active Region NOAA 8032 observed on April 15th, 1997

2000 ◽  
Vol 179 ◽  
pp. 233-236
Author(s):  
Shibu K. Mathew ◽  
Ashok Ambastha
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Field Configuration ◽  
Active Region Noaa ◽  
Magnetic Field Configuration ◽  
X Ray ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Region Noaa ◽  
Field Lines

AbstractThe active region NOAA 8032 of April 15, 1997 was observed to evolve rapidly. The GOES X-ray data showed a number of sub-flares and two C-class flares during the 8–9 hours of its evolution. The magnetic evolution of this region is studied to ascertain its role in flare production. Large changes were observed in magnetic field configuration due to the emergence of new magnetic flux regions (EFR). Most of the new emergence occured very close to the existing magnetic regions, which resulted in strong magnetic field gradients in this region. EFR driven reconnection of the field lines and subsequent flux cancellation might be the reason for the continuous occurrence of sub-flares and other related activities.

scholarly journals A solar tornado caused by flares

2013 ◽  
Vol 8 (S300) ◽  
pp. 235-238
Author(s):  
N. K. Panesar ◽  
D. E. Innes ◽  
S. K. Tiwari ◽  
B. C. Low
Keyword(s):  
Active Region ◽  
Magnetic Energy ◽  
Magnetic Pressure ◽  
The Sun ◽  
Active Region Noaa ◽  
Quiescent Prominence ◽  
Triggering Mechanism ◽  
Free Magnetic Energy ◽  
Cavity System ◽  
Region Noaa

AbstractAn enormous solar tornado was observed by SDO/AIA on 25 September 2011. It was mainly associated with a quiescent prominence with an overlying coronal cavity. We investigate the triggering mechanism of the solar tornado by using the data from two instruments: SDO/AIA and STEREO-A/EUVI, covering the Sun from two directions. The tornado appeared near to the active region NOAA 11303 that produced three flares. The flares directly influenced the prominence-cavity system. The release of free magnetic energy from the active region by flares resulted in the contraction of the active region field. The cavity, owing to its superior magnetic pressure, expanded to fill this vacated space in the corona. We propose that the tornado developed on the top of the prominence due to the expansion of the prominence-cavity system.

scholarly journals Homologous Flares and Magnetic Field Topology in Active Region NOAA 10501 on 20 November 2003

Solar Physics ◽  
2010 ◽  
Vol 269 (1) ◽  
pp. 83-104 ◽  
Author(s):  
R. Chandra ◽  
B. Schmieder ◽  
C. H. Mandrini ◽  
P. Démoulin ◽  
E. Pariat ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Active Region Noaa ◽  
Magnetic Field Topology ◽  
Region Noaa

Flow and magnetic field properties in the trailing sunspots of active region NOAA 12396

2016 ◽  
Vol 337 (10) ◽  
pp. 1090-1098 ◽  
Author(s):  
M. Verma ◽  
C. Denker ◽  
F. Böhm ◽  
H. Balthasar ◽  
C. E. Fischer ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Active Region Noaa ◽  
Region Noaa

scholarly journals The Proton Flare and Evolution of Magnetic Fields in a Decaying Active Region

1993 ◽  
Vol 141 ◽  
pp. 404-407
Author(s):  
Guiqing Zhang
Keyword(s):  
Magnetic Field ◽  
Active Region ◽  
Magnetic Fields ◽  
Longitudinal Magnetic Field ◽  
Active Region Noaa ◽  
History Of ◽  
Region Noaa

AbstractIn this paper, the evolution history of longitudinal magnetic field of a decaying active region (NOAA AR6703) was studied. We also described the X1.9/4B flare occurring in AR6703, as well as the accompaning events, and emphasized in analysizing the features of longitudinal magnetic fields before the flare.

Sign in / Sign up

Export Citation Format

Share Document