NDLI: Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind

Content Provider	Springer Nature Link
Author	Driel Gesztelyi, L. Culhane, J. L. Baker, D. Démoulin, P. Mandrini, C. H. DeRosa, M. L. Rouillard, A. P. Opitz, A. Stenborg, G. Vourlidas, A. Brooks, D. H.
Copyright Year	2012
Abstract	During 2 – 18 January 2008 a pair of low-latitude opposite-polarity coronal holes (CHs) were observed on the Sun with two active regions (ARs) and the heliospheric plasma sheet located between them. We use the Hinode/EUV Imaging Spectrometer (EIS) to locate AR-related outflows and measure their velocities. Solar-Terrestrial Relations Observatory (STEREO) imaging is also employed, as are the Advanced Composition Explorer (ACE) in-situ observations, to assess the resulting impacts on the solar wind (SW) properties. Magnetic-field extrapolations of the two ARs confirm that AR plasma outflows observed with EIS are co-spatial with quasi-separatrix layer locations, including the separatrix of a null point. Global potential-field source-surface modeling indicates that field lines in the vicinity of the null point extend up to the source surface, enabling a part of the EIS plasma upflows access to the SW. We find that similar upflow properties are also observed within closed-field regions that do not reach the source surface. We conclude that some of plasma upflows observed with EIS remain confined along closed coronal loops, but that a fraction of the plasma may be released into the slow SW. This suggests that ARs bordering coronal holes can contribute to the slow SW. Analyzing the in-situ data, we propose that the type of slow SW present depends on whether the AR is fully or partially enclosed by an overlying streamer.
Starting Page	237
Ending Page	262
Page Count	26
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	281
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-09-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Active regions Magnetic field Magnetic extrapolations Solar wind Extraterrestrial Physics, Space Sciences Meteorology/Climatology Astrophysics and Astroparticles
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

Parameters of the Magnetic Flux inside Coronal Holes

Evolution of Coronal Holes and Implications for High-Speed Solar Wind During the Minimum Between Cycles 23 and 24

How Should One Optimize Nonlinear Force-Free Coronal Magnetic Field Extrapolations from SDO/HMI Vector Magnetograms?

Slow and Fast Rotating Coronal Holes from Geomagnetic Indices

Cyclic Reversal of Magnetic Cloud Poloidal Field

Contrast of Coronal Holes and Parameters of Associated Solar Wind Streams

The Connection of Solar Wind Parameters with Radio and UV Emission from Coronal Holes

A Magnetostatic Grad–Rubin Code for Coronal Magnetic Field Extrapolations

Relation Between Coronal Hole Areas on the Sun and the Solar Wind Parameters at 1 AU

Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind

Similar Documents

Parameters of the Magnetic Flux inside Coronal Holes

Evolution of Coronal Holes and Implications for High-Speed Solar Wind During the Minimum Between Cycles 23 and 24

How Should One Optimize Nonlinear Force-Free Coronal Magnetic Field Extrapolations from SDO/HMI Vector Magnetograms?

Slow and Fast Rotating Coronal Holes from Geomagnetic Indices

Cyclic Reversal of Magnetic Cloud Poloidal Field

Contrast of Coronal Holes and Parameters of Associated Solar Wind Streams

The Connection of Solar Wind Parameters with Radio and UV Emission from Coronal Holes

A Magnetostatic Grad–Rubin Code for Coronal Magnetic Field Extrapolations

Relation Between Coronal Hole Areas on the Sun and the Solar Wind Parameters at 1 AU

Magnetic Topology of Active Regions and Coronal Holes: Implications for Coronal Outflows and the Solar Wind