Observations of the birth of a small coronal hole

Details Observations of the birth of a small coronal hole Observations of the birth of a small coronal hole

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...54..123s&link_type=abstract

Solar Physics, vol. 54, Sept. 1977, p. 123-134.

Astronomy and Astrophysics

Astronomy

18

Solar Corona, Solar Physics, X Ray Astronomy, Holes, Light Curve, Skylab Program, Solar X-Rays

Scientific paper

Using soft X-ray data from the S-054 X-ray spectrographic telescope aboard Skylab, we observed temporal changes in the emission structure of the X-ray corona associated with the birth of a small coronal hole. Designated as CH6, this coronal hole was born near the equator in a time interval less than 9-1/2 hr. By constructing a light curve for a point near the center of CH6, we observed a sudden 40% decrease in X-ray emission associated with the birth of this coronal hole. On a time scale of hours, the growth of CH6 in area proceeded faster than the average rate predicted by the diffusion of solar fields. The short term decay of CH6 followed the diffusive rate to within experimental uncertainty. On a time scale of one rotation, the subsequent development of CH6 was not consistent with steady growth at the average rate predicted by diffusion.

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