Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254l..53k&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 254, Mar. 15, 1982, p. L53-L57. Research sponsored by the U.S. Depar
Astronomy and Astrophysics
Astrophysics
82
Solar Flares, Solar X-Rays, Stellar Structure, Altitude, International Sun Earth Explorer 3, Pioneer Venus 1 Spacecraft
Scientific paper
Recent ISEE 3 and Pioneer Venus Orbiter observations relevant to the altitude structure of the hard X-ray source down to 3000 km or less above the photosphere are reported. About 90 percent of the impulsive X-ray emission and about 70 percent of the gradual emission originates at altitudes 2500 km or less above the photosphere. In the 100-500 keV range, this altitude dependence is essentially independent of photon energy. Brightness of the impulsive X-ray source decreases rapidly with increase in altitude. As far as models of the impulsive phase are concerned, the thermal model with adiabatic compression and expansion of a magnetically confined plasma and the thin target model are not consistent with these observations. The thick target model and the dissipative thermal model are consistent with the observed low altitude of the hard X-ray source.
Fenimore Edward E.
Kane Sharad R.
Klebesadel Ray W.
Laros John G.
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