scholarly journals Neutral‐Line Magnetic Shear and Enhanced Coronal Heating in Solar Active Regions

1997 ◽  
Vol 482 (1) ◽  
pp. 519-534 ◽  
Author(s):  
D. A. Falconer ◽  
R. L. Moore ◽  
J. G. Porter ◽  
G. A. Gary ◽  
T. Shimizu
Keyword(s):  
Neutral Line ◽  
Active Regions ◽  
Coronal Heating ◽  
Magnetic Shear ◽  
Solar Active Regions

scholarly journals Filter Magnetograph Measurements at Meudon Observatory

1993 ◽  
Vol 141 ◽  
pp. 199-202
Author(s):  
Audouin Dollfus ◽  
Jacques Moity
Keyword(s):  
Magnetic Field ◽  
Transverse Magnetic Field ◽  
Observational Studies ◽  
Neutral Line ◽  
Active Regions ◽  
Transverse Magnetic ◽  
Birefringent Filter ◽  
Solar Active Regions

SummaryWe report observational studies of solar active regions n°6150 and n°6850 during cycle 22. Observations were carried out with a tunable monochromatic birefringent filter coupled with a line-shifter and a Stokesmeter as well as with a spectro-magnetograph, both at Meudon Observatory. AR n°6150 is typical of emerging flux regions, while AR n° 6850, with a complex preceding δ-spot, exhibits characteristic configurations of the transverse magnetic field for flaring activity: shear along the neutral line, and curvature coupled with anomalous Evershed mass motions.

THE LIMIT OF MAGNETIC-SHEAR ENERGY IN SOLAR ACTIVE REGIONS

2012 ◽  
Vol 750 (1) ◽  
pp. 24 ◽  
Author(s):  
Ronald L. Moore ◽  
David A. Falconer ◽  
Alphonse C. Sterling
Keyword(s):  
Active Regions ◽  
Magnetic Shear ◽  
Solar Active Regions ◽  
Shear Energy

scholarly journals Electric-current Neutralization, Magnetic Shear, and Eruptive Activity in Solar Active Regions

2017 ◽  
Vol 846 (1) ◽  
pp. L6 ◽  
Author(s):  
Yang Liu ◽  
Xudong Sun ◽  
Tibor Török ◽  
Viacheslav S. Titov ◽  
James E. Leake
Keyword(s):  
Electric Current ◽  
Active Regions ◽  
Eruptive Activity ◽  
Magnetic Shear ◽  
Solar Active Regions

scholarly journals Diagnostics of Coronal Heating in Solar Active Regions

2004 ◽  
Vol 219 ◽  
pp. 478-482 ◽  
Author(s):  
A. Fludra ◽  
J. Ireland
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
Average Power ◽  
Active Regions ◽  
Coronal Heating ◽  
Magnetic Flux Density ◽  
Line Intensities ◽  
Solar Active Regions ◽  
The Relationship ◽  
Coronal Diagnostic Spectrometer

We study the relationship between EUV spectral line intensities and the photospheric magnetic field in solar active regions, using magnetograms from SOHO-MDI and EUV spectra of the Fe XVI 360.8 Â line (2 × 106 K) and the O V 629.7 A line (220,000 K) from the Coronal Diagnostic Spectrometer on SOHO, recorded for several active regions. We overlay and compare spatial patterns of the O V emission and the magnetic flux concentrations, with a 4″ x 4″ spatial resolution, and search for a relationship between the local O V line intensity and the photospheric magnetic flux density in each active region. While this dependence exhibits a certain amount of scatter, it can be represented by a power law fit. The average power index from all regions is 0.7 ± 0.2. Applying static loop models, we derive the dependence of the heating rate on the magnetic flux density, Eh ∝ B0.8, and compare it to the dependence predicted by the coronal heating models.

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