TY - JOUR
T1 - Dynamic Precursors of Flares in Active Region NOAA 10486
AU - Korsós, M. B.
AU - Gyenge, N.
AU - Baranyi, T.
AU - Ludmány, A.
N1 - Funding Information:
The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007–2013) under grant agreement eHEROES (project No. 284461). This research has made use of SunPy, an open-source and free community-developed solar data analysis package written in Python (Mumford et al. ). MBK is grateful to Science and Technology Facilities Council (STFC) UK for the financial support received.
Publisher Copyright:
© 2015, Indian Academy of Sciences.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/4/21
Y1 - 2015/4/21
N2 - Four different methods are applied here to study the precursors of flare activity in the Active Region NOAA 10486. Two approaches track the temporal behaviour of suitably chosen features (one, the weighted hori- zontal gradient WGM, is the generalized form of the horizontal gradient of the magnetic field, GM; the other is the sum of the horizontal gradient of the magnetic field, GS, for all sunspot pairs). WGM is a photospheric indicator, that is a proxy measure of magnetic non-potentiality of a specific area of the active region, i.e., it captures the temporal variation of the weighted horizontal gradient of magnetic flux summed up for the region where opposite magnetic polarities are highly mixed. The third one, referred to as the separateness parameter, Sl−f, considers the overall morphology. Further, GS and Sl−f are photospheric, newly defined quick-look indicators of the polarity mix of the entire active region. The fourth method is tracking the temporal variation of small X-ray flares, their times of succession and their energies observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager instrument. All approaches yield specific pre-cursory signatures for the imminence of flares.
AB - Four different methods are applied here to study the precursors of flare activity in the Active Region NOAA 10486. Two approaches track the temporal behaviour of suitably chosen features (one, the weighted hori- zontal gradient WGM, is the generalized form of the horizontal gradient of the magnetic field, GM; the other is the sum of the horizontal gradient of the magnetic field, GS, for all sunspot pairs). WGM is a photospheric indicator, that is a proxy measure of magnetic non-potentiality of a specific area of the active region, i.e., it captures the temporal variation of the weighted horizontal gradient of magnetic flux summed up for the region where opposite magnetic polarities are highly mixed. The third one, referred to as the separateness parameter, Sl−f, considers the overall morphology. Further, GS and Sl−f are photospheric, newly defined quick-look indicators of the polarity mix of the entire active region. The fourth method is tracking the temporal variation of small X-ray flares, their times of succession and their energies observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager instrument. All approaches yield specific pre-cursory signatures for the imminence of flares.
KW - Flares−precursor−pre-flare−geostationary operational environmental satellite−Reuven Ramaty high energy solar spectroscopic imager−SOHO/MDI-Debrecen data
UR - http://www.scopus.com/inward/record.url?scp=84929707917&partnerID=8YFLogxK
U2 - 10.1007/s12036-015-9329-x
DO - 10.1007/s12036-015-9329-x
M3 - Article
AN - SCOPUS:84929707917
SN - 0250-6335
VL - 36
SP - 111
EP - 121
JO - Journal of Astrophysics and Astronomy
JF - Journal of Astrophysics and Astronomy
IS - 1
M1 - 9329
ER -