Accession Number : AD0663415

Title :   SOLAR X-RAY SPECTRUM BELOW 25 A,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Rugge,H. R. ; Walker,A. B. C. , Jr

Report Date : OCT 1967

Pagination or Media Count : 21

Abstract : A pulse-height analyzed proportional counter and a Bragg crystal spectrometer, both mounted on a compact solar pointer, were flown on the polar, earth-oriented satellite 1966-111B and obtained solar X-ray spectra below 25 A. The crystal spectrometer yielded one highly resolved spectrum from 7 to 25 A every 250 sec. Over the observed range, much of the X-ray energy is in line radiation. The predominant lines are those of the ions N VII, O VII, O VIII, FeXVII, NeIX, NeX, and MgXI. At least 50 emission lines were observed, a number of them for the first time. Spectra taken with the crystal spectrometer under various conditions of solar activity showed that large enhancements in flux are confined to the shorter wavelength lines. The proportional counter also showed a distinct hardening of the spectrum, as well as an increase in flux with solar activity. (Author)

Descriptors :   (*SOLAR RADIATION, X RAYS), NITROGEN, OXYGEN, IRON, NEON, MAGNESIUM, SCIENTIFIC SATELLITES, LINE SPECTRA, SPECTROMETERS, SOLAR FLARES

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE