NDLI: Flare-CME Models: An Observational Perspective (Invited Review)

Content Provider	Springer Nature Link
Author	Schmieder, B. Aulanier, G. Vršnak, B.
Copyright Year	2015
Abstract	Eruptions, flares, and coronal mass ejection (CMEs) are due to physical phenomena mainly driven by an initially force-free current-carrying magnetic field. We review some key observations relevant to the current theoretical trigger mechanisms of the eruption and to the energy release via reconnection. Sigmoids observed in X-rays and UV, as well as the pattern (double J-shaped) of electric currents in the photosphere show clear evidence of the existence of currents parallel to the magnetic field and can be the signature of a flux rope that is detectable in CMEs. The magnetic helicity of filaments and active regions is an interesting indirectly measurable parameter because it can quantify the twist of the flux rope. On the other hand, the magnetic helicity of the solar structures allows us to associate solar eruptions and magnetic clouds in the heliosphere. The magnetic topology analysis based on the 3D magnetic field extrapolated from vector magnetograms is a good tool for identifying the reconnection locations (null points and/or the 3D large volumes – hyperbolic flux tube, HFT). Flares are associated more with quasi-separatrix layers (QSLs) and HFTs than with a single null point, which is a relatively rare case. We review various mechanisms that have been proposed to trigger CMEs and their observable signatures: by “breaking” the field lines overlying the flux rope or by reconnection below the flux rope to reduce the magnetic tension, or by letting the flux rope to expand until it reaches a minimum threshold height (loss of equilibrium or torus instability). Additional mechanisms are commonly operating in the solar atmosphere. Examples of observations are presented throughout the article and are discussed in this framework.
Starting Page	3457
Ending Page	3486
Page Count	30
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	290
Issue Number	12
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-06-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sun: flare Sun: coronal mass ejection Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Moreton and EUV Waves Associated with an X1.0 Flare and CME Ejection

Stealth Coronal Mass Ejections: A Perspective

Magnetic Evolution of Mini-Coronal Mass Ejections

Phase Relationships Between the CME-Energy Cycle, the Sunspot-Area Cycle and the Flare-Index Cycle

Statistical Analysis of Periodic Oscillations in LASCO Coronal Mass Ejection Speeds

An Intense Flare–CME Event in 2015: Propagation and Interaction Effects Between the Sun and Earth’s Orbit

Magnetic Field Configuration Models and Reconstruction Methods for Interplanetary Coronal Mass Ejections

Statistical Study of ICMEs and Their Sheaths During Solar Cycle 23 (1996 – 2008)

Geometrical Relationship Between Interplanetary Flux Ropes and Their Solar Sources

Flare-CME Models: An Observational Perspective (Invited Review)

Similar Documents

Moreton and EUV Waves Associated with an X1.0 Flare and CME Ejection

Stealth Coronal Mass Ejections: A Perspective

Magnetic Evolution of Mini-Coronal Mass Ejections

Phase Relationships Between the CME-Energy Cycle, the Sunspot-Area Cycle and the Flare-Index Cycle

Statistical Analysis of Periodic Oscillations in LASCO Coronal Mass Ejection Speeds

An Intense Flare–CME Event in 2015: Propagation and Interaction Effects Between the Sun and Earth’s Orbit

Magnetic Field Configuration Models and Reconstruction Methods for Interplanetary Coronal Mass Ejections

Statistical Study of ICMEs and Their Sheaths During Solar Cycle 23 (1996 – 2008)

Geometrical Relationship Between Interplanetary Flux Ropes and Their Solar Sources

Flare-CME Models: An Observational Perspective (Invited Review)