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.
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}
}
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}
}