Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009arep...53.1050o&link_type=abstract
Astronomy Reports, Volume 53, Issue 11, pp.1050-1058
Astronomy and Astrophysics
Astronomy
1
Solar Wind Plasma, Sources Of Solar Wind, Coronal Holes, Particle Emission, Solar Wind
Scientific paper
It is shown that the contrast of coronal holes (CH) determines the speed of the solar wind streams to the same extent as their area does. We analyzed more than 400 images obtained in the λ284 Å channel. The time interval under examination covers about 1500 days in the declining phase of cycle 23 (from 2002 to 2006). We considered all coronal holes recorded during that interval in the absence of coronal mass ejections (CME). Comparison was also made with some other parameters of the solar wind (e.g., density, temperature, and magnetic field). A fairly high correlation (0.70-0.89) was obtained with the velocity, especially during the periods of moderate activity, which makes this method useful for everyday forecast. The ratio of CH brightness to the mean brightness of the disk in the λ284 Å channel is about 25%.
Askerov A. B.
Livshits I. M.
Obridko Vladimir N.
Shelting B. D.
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