Limb observations of the 12.32 micron solar emission line during the 1991 July total eclipse
1992; IOP Publishing; Volume: 396; Linguagem: Inglês
10.1086/186515
ISSN1538-4357
AutoresDrake Deming, Donald E. Jennings, G. H. McCabe, R. W. Noyes, G. Wiedemann, Fred Espenak,
Tópico(s)Ionosphere and magnetosphere dynamics
Resumoview Abstract Citations (16) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Limb Observations of the 12.32 Micron Solar Emission Line during the 1991 July Total Eclipse Deming, Drake ; Jennings, Donald E. ; McCabe, George ; Noyes, Robert ; Wiedemann, Gunter ; Espenak, Fred Abstract The limb profile of the Mg I 12.32-micron emission line is determined by occultation in the July 11, 1991 total solar eclipse over Mauna Kea. It is shown that the emission peaks are very close to the 12-micron continuum limb, as predicted by recent theory for this line as a non-LTE photospheric emission. The increase in optical depth for this extreme limb-viewing situation indicates that most of the observed emission arises from above the chromospheric temperature minimum, and it is found that this emission is extended to heights well in excess of the model predictions. The line emission can be observed as high as 2000 km above the 12-micron continuum limb, whereas theory predicts it to remain observable no higher than about 500 km above the continuum limb. The substantial limb extension observed in this line is quantitatively consistent with limb extensions seen in the far-IR continuum, and it is concluded that it is indicative of departures from gravitational hydrostatic equilibrium, or spatial inhomogeneities, in the upper solar atmosphere. Publication: The Astrophysical Journal Pub Date: September 1992 DOI: 10.1086/186515 Bibcode: 1992ApJ...396L..53D Keywords: Emission Spectra; Infrared Astronomy; Solar Atmosphere; Solar Eclipses; Solar Limb; Chromosphere; Infrared Telescopes; Nonequilibrium Thermodynamics; Optical Thickness; Photosphere; Solar Physics; INFRARED: GENERAL; SUN: ATMOSPHERE; SUN: GENERAL full text sources ADS |
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