The Thermodynamic State of the Outer Solar ATMOSPHERE.V.A.MODEL of the Chromosphere from the Continuum Emission.
1955; Institute of Physics; Volume: 1; Linguagem: Inglês
10.1086/190014
ISSN1538-4365
AutoresR. G. Athay, Donald H. Menzel, Jean-Claude Pecker, R. N. Thomas,
Tópico(s)Astro and Planetary Science
Resumoview Abstract Citations (46) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Thermodynamic State of the Outer Solar ATMOSPHERE.V.A.MODEL of the Chromosphere from the Continuum Emission. Athay, R. G. ; Menzel, D. H. ; Pecker, J. -C. ; Thomas, R. N. Abstract Four semi-independent analyses of 1952 eclipse data contribute to a determination of n and T in the solar chromosphere in the height range from -120 km to 6000 km: (1) The intensity of the continuous emission at X 4700 indicates that T, increases with height from about 4800 at - 65 km. (2) The emission, per cubic centimeter, in the Balmer continuum attains a maximum near 500 km, which indicates that here the free electrons begin to come mainly from H rather than from metals, and thus places the limits: 5000 < T < 7000 , 4 X 1011 <n < S X 1011 at this height. (3) The intensities of the continuum at X 4700 and X 3640 require values of T as follows: 5000 at 500 km, 6100 at 1000 km, and 6700 at 3000 kin. In the interval 1()()( 3000 kin the ionization of H increases from about 3 to about 80 per cent. (4) Above 3000 kin no data on the Balmer free-bound continuum exist, and an extension of the results of 3 to greater heights requires the use of the height gradient of the Balmer lines to replace that of the continuum. Such a technique fixes T only within certain limits, which, at 6000 km, are: 2 X 10 < T < 1.2 X 10 . The chief uncertainty of the analysis lies in the use of the assumption of a continuous distribution of material in the atmosphere. The results of the analysis suggest the validity of such assumption below about 2500 kin, and its breakdown above about 3000 km. An estimate of optical depth in the continuum, from the present analysis, at a height of 500 km produces a value agreeing well with an estimate based on the analysis of the lines. Publication: The Astrophysical Journal Supplement Series Pub Date: May 1955 DOI: 10.1086/190014 Bibcode: 1955ApJS....1..505A full text sources ADS |
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