Magnetic helicity balance during a filament eruption that occurred in active region NOAA 9682

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.

Download Full-text

Relation between magnetic helicity injection and flare activities in active region NOAA 8100

Advances in Space Research ◽

10.1016/s0273-1177(03)90631-4 ◽

2003 ◽

Vol 32 (10) ◽

pp. 1949-1952 ◽

Cited By ~ 21

Author(s):

T. Yokoyama ◽

K. Kusano ◽

T. Maeshiro ◽

T. Sakurai

Keyword(s):

Active Region ◽

Magnetic Helicity ◽

Active Region Noaa ◽

Helicity Injection ◽

Region Noaa

Download Full-text

STUDY OF MAGNETIC HELICITY INJECTION IN THE ACTIVE REGION NOAA 9236 PRODUCING MULTIPLE FLARE-ASSOCIATED CORONAL MASS EJECTION EVENTS

The Astrophysical Journal ◽

10.1088/0004-637x/778/1/13 ◽

2013 ◽

Vol 778 (1) ◽

pp. 13 ◽

Cited By ~ 13

Author(s):

Sung-Hong Park ◽

Kanya Kusano ◽

Kyung-Suk Cho ◽

Jongchul Chae ◽

Su-Chan Bong ◽

...

Keyword(s):

Active Region ◽

Coronal Mass Ejection ◽

Magnetic Helicity ◽

Active Region Noaa ◽

Helicity Injection ◽

Region Noaa ◽

Mass Ejection

Download Full-text

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

Download Full-text

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

Download Full-text

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

Download Full-text

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.

Download Full-text