NDLI: Studies of Microflares and C5.2 flare of 27 September 1998

Content Provider	Springer Nature Link
Author	Wang, Haimin Chae, Jongchul Qiu, Jiong Lee, Chik Yin Goode, Philip R.
Copyright Year	1999
Abstract	On 27 September 1998, Big Bear Solar Observatory (BBSO) and Transition Region and Coronal Explorer (TRACE) coordinated observations from 16:00 to 19:00 UT to study properties of microflares in AR NOAA No. 8340. Fortuitously, a C5.2 flare occurred at 16:30 UT in this active region. Hα and magnetograph movies were obtained at BBSO; C iv 1550 Å, Fe ix 171 Å, and Fe xii 195 Å movies were obtained by TRACE; both with a cadence about 1 min. In this paper, we concentrate on the study of magnetic properties of 70 C iv microflares, as well as their relationship to the C5.2 flare. We obtained the following results: (1) We found two kinds of microflares: microflares of transient brightenings with a time scale of 1 to 5 min (impulsive events) and microflares lasting half an hour or longer (persistent events). Ninety percent of the microflares are impulsive events. Most of the event in this category are associated with well defined magnetic neutral lines, but some are found in non-neutral line areas. All of seven persistent events are found at parasitic magnetic configurations with inclusions of small magnetic flux within dominant magnetic flux of opposite polarity. (2) More than a third of the impulsive microflares occurred near the C5.2 flare site indicating that a local instability is responsible for both the C5.2 flare and microflares. This indirectly supports the avalanche theory of flare energy release, which implies that a big flare may be spatially associated with many small flares.
Starting Page	365
Ending Page	376
Page Count	12
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	188
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astrophysics
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

Multi-wavelength observations of the 1998 September 27 flare spray

Microflares as a stage of solar flare events

A flare of 23 September 1998: relation between temporal and spatial structures

Microflares and thermal background of the solar corona

Astrophysics and Space Science : Volume 259, Issue 4, September 1998

Astrophysics and Space Science : Volume 262, Issue 3, September 1998

Spectral Analysis of a Thermal Flare on 27 October 1993

Observations of the 24 September 1997 Coronal Flare Waves

Multi-Wavelength Observation of the 3n/x3.3 Flare of 28 November 1998

Studies of Microflares and C5.2 flare of 27 September 1998

Similar Documents

Multi-wavelength observations of the 1998 September 27 flare spray

Microflares as a stage of solar flare events

A flare of 23 September 1998: relation between temporal and spatial structures

Microflares and thermal background of the solar corona

Astrophysics and Space Science : Volume 259, Issue 4, September 1998

Astrophysics and Space Science : Volume 262, Issue 3, September 1998

Spectral Analysis of a Thermal Flare on 27 October 1993

Observations of the 24 September 1997 Coronal Flare Waves

Multi-Wavelength Observation of the 3n/x3.3 Flare of 28 November 1998

Studies of Microflares and C5.2 flare of 27 September 1998