Time Evolution of Force-Free Parameter and Free Magnetic Energy in Active Region NOAA 10365

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.

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TIME EVOLUTION OF CORONAL MAGNETIC HELICITY IN THE FLARING ACTIVE REGION NOAA 10930

The Astrophysical Journal ◽

10.1088/0004-637x/720/2/1102 ◽

2010 ◽

Vol 720 (2) ◽

pp. 1102-1107 ◽

Cited By ~ 32

Author(s):

Sung-Hong Park ◽

Jongchul Chae ◽

Ju Jing ◽

Changyi Tan ◽

Haimin Wang

Keyword(s):

Active Region ◽

Time Evolution ◽

Magnetic Helicity ◽

Active Region Noaa ◽

Region Noaa

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Reconstruction of the Coronal Magnetic Field for Active Region NOAA 8151

Symposium - International Astronomical Union ◽

10.1017/s0074180900219761 ◽

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.

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Morphology of the flare-productive active region NOAA 9087

Kinematika i fizika nebesnyh tel (Online) ◽

10.15407/kfnt2020.03.069 ◽

2020 ◽

Vol 36 (3) ◽

pp. 69-90

Author(s):

S. N. Chornogor ◽

◽

N. N. Kondrashova ◽

Keyword(s):

Active Region ◽

Active Region Noaa ◽

Region Noaa

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Characteristics of Soft X-Ray Radiation of the Solar Active Region NOAA 1024 Registered by the PINGVIN-M Device in July 2009

Geomagnetism and Aeronomy ◽

10.1134/s001679322007021x ◽

2020 ◽

Vol 60 (7) ◽

pp. 936-941

Author(s):

M. I. Savchenko ◽

P. V. Vatagin ◽

P. B. Dmitriev ◽

M. G. Ogurtsov ◽

E. M. Kruglov ◽

...

Keyword(s):

Active Region ◽

Solar Active Region ◽

Active Region Noaa ◽

X Ray ◽

Region Noaa

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The three-dimensional structure of the corona above active region NOAA 9591 from microwave observations

Astronomy Reports ◽

10.1134/s1063772906080087 ◽

2006 ◽

Vol 50 (8) ◽

pp. 679-686 ◽

Cited By ~ 2

Author(s):

N. G. Peterova ◽

B. V. Agalakov ◽

T. P. Borisevich ◽

A. N. Korzhavin ◽

B. I. Ryabov

Keyword(s):

Active Region ◽

Three Dimensional ◽

Dimensional Structure ◽

Active Region Noaa ◽

Three Dimensional Structure ◽

Region Noaa

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Where do running penumbral waves emerge in chromosphere?

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318001576 ◽

2018 ◽

Vol 13 (S340) ◽

pp. 155-156

Author(s):

T. G. Priya ◽

Jiangtao Su ◽

Robertus Erd̎elyi

Keyword(s):

Active Region ◽

Active Region Noaa ◽

Long Period ◽

Wave Guides ◽

Spiral Structures ◽

Region Noaa ◽

Umbral Oscillations

AbstractThe earlier work on the oscillatory phenomena in sunspot structures have supported in validating the detection of long-period oscillations, which are generated by the photospheric umbral response to the five minute p-mode global oscillations. We report here on the events of 3- min umbral oscillations which are detected within a duration of one hour from a single-polarity sunspot of active region NOAA 12132. The umbral oscillations that appear first around umbral boundaries is speculated to be excited by the wavefronts at the umbral-penumbral boundaries due to sub-photospheric or photospheric granular buffetings. The appearance of the wavefronts in spiral structures suggests that the wave guides are twisted. In addition, the newly formed running penumbral waves (RPWs) appears to be connected with the preceding RPWs.

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