Extreme limb profiles of the sun at far-infrared and submillimeter wavelengths

Details Extreme limb profiles of the sun at far-infrared and submillimeter wavelengths Extreme limb profiles of the sun at far-infrared and submillimeter wavelengths

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..448l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. 448-458. Previously announced in STAR as N86-32375.

Astronomy and Astrophysics

Astrophysics

25

Chromosphere, Far Infrared Radiation, Limb Brightening, Solar Eclipses, Solar Limb, Solar Radiation, Submillimeter Waves, Sun, Data Acquisition, Mathematical Models, Solar Temperature

Scientific paper

Thirty, 50, 100, and 200 microns solar limb intensity profiles determined with arcsecond resolution from airborne observations of the occultation of the solar limb during the total eclipse of July 31, 1981, are presented. Two points of particular importance emerge: (1) the longer-wavelength (100 and 200 micron) limbs are significantly brighter than disk center. At 200 microns the extreme limb is about 1.22 times the brightness of disk center. This is consistent with the 6000 K temperature-plateau structure of the model chromospheres of Vernazza, Avrett, and Loeser (1973, Ap. J., 184, 605; 1981; Ap. J. Suppl., 45, 635); and (2) the longer wavelength limbs are extended significantly further above the visible limb than Vernazza, Avrett, and Loeser predict. These results provide a strong basis for modeling of the solar chromosphere free from the assumption of gravitational-hydrostatic equilibrium.

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