๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Further X-ray spectra of solar active regions

โœ Scribed by R. M. Batstone; K. Evans; J. H. Parkinson; K. A. Pounds

Publisher
Springer
Year
1970
Tongue
English
Weight
425 KB
Volume
13
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

Measurements of the solar X-ray spectrum between 3/~ and 15 A are reported. They were made with two slitless Bragg crystal spectrometers flown on a Sun-pointed Skylark rocket on 8 August, 1967.

The use of a beryl crystal has provided higher spectral resolution than hitherto in the spectral range 12 A and 15/~ leading, in particular, to a revised identification of the strong line at 13.71 A. Separate components of the stronger emission lines are clearly seen from each of three coronal active regions which may be identified on radio and X-ray spectroheliograms.

The absolute line fluxes are used to determine a model for each active region in terms of the differential emission measure as a function of electron temperature. Emission lines due to the transition ls 21So -ls2s aS1 in several helium-like ions are identified and values of the local electron density derived from measurement of the line flux in these ions.

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