Accession Number : ADA193026

Title :   The Properties of Solar Coronal Active Regions Deduced from X-Ray Line Spectra,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA SPACE SCIENCES LAB

Personal Author(s) : McKenzie, D L

PDF Url : ADA193026

Report Date : 05 Feb 1988

Pagination or Media Count : 34

Abstract : Coronal active regions, the sites of energetic solar flares, have temperatures higher than 10 K and emit strongly in the X-ray region of the spectrum. In this report X-ray emission line-ratio diagnostics for electron density and temperature are applied to over 100 spectra of nonflaring active regions taken by the SOLEX B spectrometer aboard the U.S. Department of Defense Space Test Program's P78-1 Satellite from March to November 1979. The purpose is to draw general conclusions from analysis of the spectra of a large variety of regions. In the course of the study, we were also able to evaluate existing theoretical calculations of the helium-like ion line ratios. A number of them can now be rejected as inconsistent with the data. Future work may modify the conclusions of the study, but not significantly.

Descriptors :   *SOLAR CORONA, *X RAY SPECTRA, COMPUTATIONS, CORONAS, ELECTRON DENSITY, ENERGETIC PROPERTIES, LINE SPECTRA, SOLAR ACTIVITY, SOLAR FLARES, THEORY, X RAYS, ELECTRON ENERGY

Subject Categories : Astrophysics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE