On the dependence of the solar wind velocity on the fractional area of coronal holes in latitude

摘要

The relationship between the fractional area of coronal holes in latitude and the maximum velocity of the fast solar wind at 1 AU based on AIA/SDO and ACE/SWEPAM observations is considered for the period from June 2015 to March 2017. Coronal hole areas were determined within the meridional slice ±10°. It has been shown that the coronal holes within ±40o in latitude give the greatest contribution to the fast ecliptic solar wind. The maximum correlation coefficient between the fractional area of coronal holes and the maximum velocity was found to be equal to 0.762 ± 0.145. The probable causes of the discrepancy between the predicted and observed values of the solar wind velocity are discussed.