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Geometry of the chromosphere-corona transition region inferred from the center-to-limb variation of the radio emission

Abstract

Based on the observations of the EUV spectroheliograms, the effective chromosphere-corona transition region is assumed to be restricted in a small volume element in the boundaries of the supergranular network. The center-to-limb variation of the quiet Sun at cm and dm wavelengths is analyzed to determine where the transition region is located in the network boundaries. Expressions are derived for the theoretical center-to-limb variation of the hypothetical brightness temperature only from the transition region, taking into account the orientation of the spicules. Comparison with the observations shows that the spicule-sheath model (Brueckner and Nicolas, 1973) and the hot plagette model (Foukal, 1974) are not compatible with the observations, because the limb brighening predicted by these models is too great. A new picture is therefore proposed that thin platelet transition regions are placed on top of the chromosphere and scattered between the network boundaries (platlet transition-region model). This model is in accord with the observed center to limb variation of the radio emission.
Authors:
Kanno, M; [1]  Tanaka, R [2] 
  1. Kyoto Univ. (Japan)
  2. Niigata Univ. (Japan)
Publication Date:
Jul 01, 1975
Product Type:
Journal Article
Reference Number:
EDB-76-056013
Resource Relation:
Journal Name: Sol. Phys.; (Netherlands); Journal Volume: 43:1
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SOLAR ATMOSPHERE; RADIOWAVE RADIATION; BRIGHTNESS; CHROMOSPHERE; DELTA FUNCTION; ELECTRON DENSITY; ELECTRON TEMPERATURE; EMISSION; EXTREME ULTRAVIOLET RADIATION; LAPLACE TRANSFORMATION; SOLAR CORONA; SOLAR PROMINENCES; SPATIAL DISTRIBUTION; SUN; ULTRAHIGH TEMPERATURE; VARIATIONS; ATMOSPHERES; DISTRIBUTION; ELECTROMAGNETIC RADIATION; FUNCTIONS; INTEGRAL TRANSFORMATIONS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; SOLAR ACTIVITY; STARS; TRANSFORMATIONS; ULTRAVIOLET RADIATION; 640104* - Astrophysics & Cosmology- Solar Phenomena
OSTI ID:
7190141
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: SLPHA
Submitting Site:
INIS
Size:
Pages: 63-77
Announcement Date:
Jun 01, 1976

Citation Formats

Kanno, M, and Tanaka, R. Geometry of the chromosphere-corona transition region inferred from the center-to-limb variation of the radio emission. Netherlands: N. p., 1975. Web.
Kanno, M, & Tanaka, R. Geometry of the chromosphere-corona transition region inferred from the center-to-limb variation of the radio emission. Netherlands.
Kanno, M, and Tanaka, R. 1975. "Geometry of the chromosphere-corona transition region inferred from the center-to-limb variation of the radio emission." Netherlands.
@misc{etde_7190141,
title = {Geometry of the chromosphere-corona transition region inferred from the center-to-limb variation of the radio emission}
author = {Kanno, M, and Tanaka, R}
abstractNote = {Based on the observations of the EUV spectroheliograms, the effective chromosphere-corona transition region is assumed to be restricted in a small volume element in the boundaries of the supergranular network. The center-to-limb variation of the quiet Sun at cm and dm wavelengths is analyzed to determine where the transition region is located in the network boundaries. Expressions are derived for the theoretical center-to-limb variation of the hypothetical brightness temperature only from the transition region, taking into account the orientation of the spicules. Comparison with the observations shows that the spicule-sheath model (Brueckner and Nicolas, 1973) and the hot plagette model (Foukal, 1974) are not compatible with the observations, because the limb brighening predicted by these models is too great. A new picture is therefore proposed that thin platelet transition regions are placed on top of the chromosphere and scattered between the network boundaries (platlet transition-region model). This model is in accord with the observed center to limb variation of the radio emission.}
journal = []
volume = {43:1}
journal type = {AC}
place = {Netherlands}
year = {1975}
month = {Jul}
}