NDLI: Subtelescopic Inhomogeneities of Electron Density in the Solar Corona

Content Provider	Springer Nature Link
Author	Kurochka, L. N. Matsuura, O. T. Picazzio, E.
Copyright Year	1997
Abstract	The brightness of the solar corona due to Thomson scattering depends linearly on the electron density, while the brightness due to the Balmer continuum is proportional to its square. As a consequence, information on the distribution of the electron density in the corona can be obtained by comparing the radial profiles of the surface brightness in both continua. This idea was explored for the first time in the solar eclipse of November 03, 1994, in Foz do Iguaçu, PR, Brazil. Pictures of the corona were obtained with interference filters, one centered at 477 nm (Thomson continuum) and another one at 347 nm (Balmer continuum). The second filter also transmits the Thomson continuum through its spectral window, so that the Balmer images contain Thomson contamination. This paper reports on the observational results and presents their preliminary analysis. It was found that in certain radial directions, the normalized profiles of both continua (Thomson and contaminated Balmer) coincide, but in other directions they differ significantly. The non-coincident profiles may only occur if Balmer emission becomes important in relation to the Thomson scattering. A simple calculation shows that in such cases the electron density in the inner corona must exceed the values of standard models by up to ≃ 6.1 × 10$^{4}$ times, maintaining however the total number of electrons along the line of sight in agreement with the prediction of standard models. It is concluded that the corona contains high electron concentration in cloudlets of subtelescopic sizes down to ≃ 10$^{6}$ cm. The varied behavior of the radial profiles of both continua in different radial directions, suggests that the subtelescopic structures might be related to the spatially variable topology of coronal magnetic flux tubes.
Starting Page	227
Ending Page	233
Page Count	7
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	170
Issue Number	2
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

Dynamics of electron beams in the inhomogeneous solar corona plasma

Propagation of a Monoenergetic Electron Beam in the Solar Corona

Electron Excitation Rates in the Solar Corona for non-Maxwellian Electron Distributions

Apparent angular sizes of the sources of microwave subsecond pulses and electron-density fluctuations in the lower solar corona

Multibaseline observations of the occultation of Crab Nebula by the solar corona at decameter wavelengths

The Ionization Equilibrium in the Solar Corona for the Electron Power Distribution

Three-Dimensional Electron Density from Tomographic Analysis of LASCO-C2 Images of the K-Corona Total Brightness

Tracing the Electron Density from the Corona to 1 au

Wind in the Solar Corona: Dynamics and Composition

Subtelescopic Inhomogeneities of Electron Density in the Solar Corona

Similar Documents

Dynamics of electron beams in the inhomogeneous solar corona plasma

Propagation of a Monoenergetic Electron Beam in the Solar Corona

Electron Excitation Rates in the Solar Corona for non-Maxwellian Electron Distributions

Apparent angular sizes of the sources of microwave subsecond pulses and electron-density fluctuations in the lower solar corona

Multibaseline observations of the occultation of Crab Nebula by the solar corona at decameter wavelengths

The Ionization Equilibrium in the Solar Corona for the Electron Power Distribution

Three-Dimensional Electron Density from Tomographic Analysis of LASCO-C2 Images of the K-Corona Total Brightness

Tracing the Electron Density from the Corona to 1 au

Wind in the Solar Corona: Dynamics and Composition

Subtelescopic Inhomogeneities of Electron Density in the Solar Corona