NDLI: Large-Scale Magnetic Field Structures and Coronal Holes on the Sun

Content Provider	Springer Nature Link
Author	Mogilevsky, E. I. Obridko, V. N. Shilova, N. S.
Copyright Year	1997
Abstract	This paper is aimed at establishing the relationship between the large-scale magnetic fields (LSMF), coronal holes (CH), and active regions (AR) in the Sun. The LSMF structure was analyzed by calculating the vector photospheric magnetic field under a potential approximation. Synoptic maps were drawn to study the distribution of the B $_{⊥}$ field component and to isolate regions where the open field lines of the unipolar magnetic field are most radial. These are the sites of occurrence of X-ray and Hei 10830 Å coronal holes detected from the SXT/Yohkoh images. It is shown that coronal holes are usually located in LSMF regions with a typical pattern of divergentB $_{⊥}$ vectors and a so-called ‘saddle’ configuration.B $_{⊥}$ vectors from the ‘conjugate’ (spaced by 90°) coronal holes converge towards the active regions between CH. Variations in AR distort coronal holes and change their boundaries. This implies that the energy regime in CH depends on the energy supply from the active region. The LSMF structure is more stable than coronal holes, remaining practically unchanged during tens of rotations of the Sun. Thus, a peculiar magnetically coupled system of LSMF/CH/AR has been revealed. A model has been suggested to describe the interaction of the emerging toroids in the convection zone and in the photosphere. The cellular convection, that develops at the center of the toroids, is responsible for the occurrence of active regions. The model qualitatively describes the observed particularities of the LSMF/CH/AR system.
Starting Page	107
Ending Page	121
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	176
Issue Number	1
e-ISSN	1573093X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1997-01-01
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

Sausage Oscillations in Multishell Coronal Structures

Global Coronal Seismology

Coronal Mass Ejections, Magnetic Fields, and the Green Corona in Cycle 23

Magnetic Field in the Gravitationally Stratified Coronal Loops

Why Study the Sun?

Automatic Detection and Classification of Coronal Holes and Filaments Based on EUV and Magnetogram Observations of the Solar Disk

Parameters of the Magnetic Flux inside Coronal Holes

The large-scale magnetic field on the Sun: The equatorial region

Damped Oscillations of Coronal Loops

Large-Scale Magnetic Field Structures and Coronal Holes on the Sun

Similar Documents

Sausage Oscillations in Multishell Coronal Structures

Global Coronal Seismology

Coronal Mass Ejections, Magnetic Fields, and the Green Corona in Cycle 23

Magnetic Field in the Gravitationally Stratified Coronal Loops

Why Study the Sun?

Automatic Detection and Classification of Coronal Holes and Filaments Based on EUV and Magnetogram Observations of the Solar Disk

Parameters of the Magnetic Flux inside Coronal Holes

The large-scale magnetic field on the Sun: The equatorial region

Damped Oscillations of Coronal Loops

Large-Scale Magnetic Field Structures and Coronal Holes on the Sun