Results 111 to 120 of about 8,180,974 (123)

The Eruption of Active Region Filaments and Its Relation to the Triggering of a Solar Flare

Solar Physics, 1981
The formation and eruption of active region filaments is supposed to be caused by the increase of a concentrated current embedded in the active region background magnetic field of an active region according to the theory of Van Tend and Kuperus (1978).
W van Tend
exaly   +2 more sources

Comprehensive Analysis of a Filament-Embedding Solar Active Region at Different Stages of Evolution

Astrophysical Journal Letters
Abstract Active regions are the brightest structures seen in the solar corona, so their physical properties hold important clues to the physical mechanisms underlying coronal heating. In this work, we present a comprehensive study for a filament-embedding active region as determined from observations from multiple facilities including ...
Ming-De Ding
exaly   +3 more sources

Sites of Flares and Filaments in Solar Active Regions

Advances in Space Research, 1993
Abstract We applied a method developed to derive from magnetic field data the location of energy release in solar active regions. This method has been applied to two sets of data (June 13–15 1980 and June 23–25 1989) using magnetograms (Meudon, MSFC, Potsdam) and Hα data (Debrecen, MSDP Meudon).
Pascal Démoulin, Brigitte Schmieder
exaly   +2 more sources

Forbush Decreases Associated with Coronal Holes, Coronal Ejections from Active Regions, and Filament Ejections: Comparison in Solar Cycles 23 and 24

Геомагнетизм и аэрономия, 2023
In this paper, we study the similarities and differences of Forbush decreases in solar cycles 23 and24. Groups of events associated with various types of solar sources were analyzed: coronal mass ejections fromactive regions accompanied by solar flares (CME1 group), filament ejections outside active regions (CME2group), and high-velocity streams from ...
A. A. Melkumyan, A. V. Belov, M. A. Abunina, N. S. Shlyk, A. A. Abunin, V. A. Oleneva, V. G. Yanke   +6 more
openaire   +1 more source

On Small Active Region Filaments, Fibrils and Surges

Advances in Space Research, 2008
High resolution Hα images and magnetograms (0.2 arc s) of an active region were obtained in alternating time series at 42 s cadences using the Swedish 1-m Solar Telescope on 2004 August 21.
Andra, 3, Lin, Y, van Noort, Michiel,
exaly   +2 more sources

ON THE POSSIBLE CHANGES OF THE SOLAR DIFFERENTIAL ROTATION DURING THE ACTIVITY CYCLE DETERMINED USING MICROWAVE LOW-BRIGHTNESS-TEMPERATURE REGIONS AND Hα FILAMENTS AS TRACERS

Solar Physics, 1997
The solar rotation rate obtained using the microwave Low-brightness-Temperature Regions (LTRs) as tracers in the heliographic range up to 55 degrees from the years 1979-1980, 1981-1982, 1987-1988, and 1989-1991 varied from 3 per cent to 4 per cent in medium latitudes and below 1 per cent at the equator.
Brajša, Roman, Ruždjak, Vladimir, Vršnak, Bojan, Pohjolainen, Silja, Urpo, Seppo, Schroll, Alfred, Woehl, Hubertus   +6 more
openaire   +2 more sources

On the possible changes of the solar differential rotation during the activity cycle determined using microwave low-brightness-temperature regions and H-alpha filaments as tracers

Solar physics, 1997
The solar rotation rate obtained using the microwave Low-brightness-Temperature Regions (LTRs) as tracers in the heliographic range up to 55 degrees from the years 1979-1980, 1981-1982, 1987-1988, and 1989-1991 varied from 3 per cent to 4 per cent in medium latitudes and below 1 per cent at the equator.
Brajša, Roman, Ruždjak, Vladimir, Vršnak, Bojan   +2 more
openaire  

Magnetic Changes Observed in the Formation of Two Filaments in a Complex Active Region: TRACE and MSDP Observations

Solar Physics, 2004
Cristiana Dumitrache, Edward E DeLuca, Jean-Marie Malherbe   +2 more
exaly  

The Formation and Magnetic Structures of Active-Region Filaments Observed by NVST, SDO, and Hinode

Astrophysical Journal, Supplement Series, 2015
X L Yan, D F Kong, Z K Xue
exaly  

Unwinding Motion of a Twisted Active Region Filament

Astrophysical Journal, 2014
X L Yan, D F Kong, Z K Xue
exaly