Abstract
view Abstract Citations (26) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Height Distribution and Directionality of 2-12 a X-Ray Flare Emission in the Solar Atmosphere Catalano, Charles P. ; van Allen, James A. Abstract The emission of soft X-rays (2-12 A) in solar flares has been studied in a new way by using simultaneous observations by two spacecraft near the Earth (Explorers 33 and 35) and another at a markedly different heliocentric longitude (Mariner 5) during the 117-day period 1967 July 28- November 21. Detailed intensity versus time observations on 607 separate flares were obtained. The principal findings are as follows: (a) The effective temperature T of the emitting plasma is (8 1 2) x 106 K for flares of small and moderate intensity. T increases to 20 x 106 K for the most intense flares. (b) The angular distribution of emission is independent of solar zenith angle to an accuracy of a few percent. (c) For flares that are fully visible from one spacecraft but partly occulted by the solar disk as viewed by the other, the dependence of soft X-ray emission I on altitude h above the photosphere is found to be well represented by dI/dh cc exp (- hIh0) with h0 = (11 1 3) x 10 km. Subject headings: flares, solar - X-rays, solar Publication: The Astrophysical Journal Pub Date: October 1973 DOI: 10.1086/152420 Bibcode: 1973ApJ...185..335C full text sources ADS |
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