Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49...79g&link_type=abstract
Solar Physics, vol. 49, July 1976, p. 79-90.
Astronomy and Astrophysics
Astronomy
28
Radiative Lifetime, Solar Corona, Solar X-Rays, Spaceborne Astronomy, X Ray Spectra, Astronomical Spectroscopy, Histograms, Magnetic Flux, Skylab Program, Solar Magnetic Field, Solar Physics, X Ray Telescopes
Scientific paper
The lifetime 'spectrum' of X-ray bright points (XBPs) is measured for a sample of 300 such features using soft X-ray images obtained with the S-054 X-ray spectrographic telescope aboard Skylab. 'Spectrum' here is defined as a function which gives the relative number of XBPs having a specific lifetime as a function of lifetime. The results indicate that a two-lifetime exponential can be fit to the decay curves of XBPs, that the spectrum is heavily weighted toward short lifetimes, and that the number of features lasting 20 to 30 hr or more is greater than expected. A short-lived component with an average lifetime of about 8 hr and a long-lived 1.5-day component are consistently found along with a few features lasting 50 hr or more. An examination of differences among the components shows that features lasting 2 days or less have a broad heliocentric-latitude distribution while nearly all the longer-lived features are observed within 30 deg of the solar equator.
Golub Leon
Krieger Allen S.
Vaiana Giuseppe S.
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