Can I read Low-Latitude Coronal Holes at the Minimum of the 23rd Solar Cycle on EtoBox?

Low-Latitude Coronal Holes at the Minimum of the 23rd Solar Cycle by Abramenko, V.; Yurchyshyn, V.; Linker, J.; Mikic, Z.; Luhmann, J.; Lee, C. is a scholarly article available to read on EtoBox.

What is Low-Latitude Coronal Holes at the Minimum of the 23rd Solar Cycle about?

Low and mid-latitude coronal holes (CHs) observed on the Sun during the current solar activity minimum (from September 21, 2006, Carrington rotation (CR) 2048, until June 26, 2009 (CR 2084)) were analyzed using {\it SOHO}/EIT and STEREO-A SECCHI EUVI data. From both the observations and Potential Field Source Surface (PFSS) modeling, we find that the area occupied by CHs inside a belt of $\pm 40^\circ$ around the solar equator is larger in the current 2007 solar minimum relative to the similar phase of the previous 1996 solar minimum. The enhanced CH area is related to a recurrent appearance of five persistent CHs, which survived during 7-27 solar rotations. Three of the CHs are of positive magnetic polarity and two are negative. The most long-lived CH was being formed during 2 days and existed for 27 rotations. This CH was associated with fast solar wind at 1 AU of approximately 620$\pm 40$ km s$^{-1}$. The 3D MHD modeling for this time period shows an open field structure above this CH. We conclude that the global magnetic field of the Sun possessed a multi-pole structure during this time period. Calculation of the harmonic power spectrum of the solar magnetic field demonstrates

Author

Abramenko, V.; Yurchyshyn, V.; Linker, J.; Mikic, Z.; Luhmann, J.; Lee, C.

Published

2010

Language

EN