Observations of coronal structure during sunspot maximum |
| |
Authors: | N R Sheeley Jr R A Howard M J Koomen D J Michels K L Harvey J W Harvey |
| |
Institution: | (1) E. O. Hulburt Center for Space Research, Naval Research Laboratory, 20375 Washington D.C., USA;(2) Solar Physics Research Corporation, 85718 Tucson, Ariz., USA;(3) Kitt Peak National Observatory, 85726 Tucson, Ariz., USA |
| |
Abstract: | This paper presents some of the results that have been obtained from the Kitt Peak observations of coronal holes and the NRL observations of coronal transients during the recent years near sunspot maximum (1979–1981). On the average, low-latitude coronal holes of comparable size contained 3 times more flux near sunspot maximum than near the previous minimum. In the outer corona, transients occurred at the observed rate of at least 2 per day, and quiet conditions persisted during less than 15 % of the observed days. We describe a sample of the more than 800 events that we have observed so far, including the observation of a comet apparently colliding with the Sun.Paper presented at the IX-th Lindau Workshop The Source Region of the Solar Wind.Visiting Astronomer, KPNO.Operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|