An observational study of coronal hole rotation over the sunspot cycle |
| |
| Authors: | Patricia Navarro-Peralta Antonio Sanchez-Ibarra |
| |
| Institution: | (1) Centro de Investigacion en Astronomia Solar, CIAS, 83280 Hermosillo Sonora, Mexico;(2) Centro de Investigacion en Fisica, Universidad de Sonora, 83190 Hermosillo Sonora, Mexico |
| |
| Abstract: | An analysis of the rotation of coronal holes (CHs) spanning 18 years was done based on data from theCatalogue of Coronal Holes (Sanchez-Ibarra and Barraza-Paredes, 1992). A differential rotation of CHs is confirmed for the totality of CHs, but a different behavior was found when those were separated as equatorial or isolated, and polar hole extensions, such as in theCatalogue. Isolated CHs show a typical differential rotation, but polar hole extensions display two different types of behavior: a rotation rate below  40° ± 5° of heliographic latitude, increasing to the equator, and a rotation rate above the same heliographic latitude but increasing to the poles. Also discussed here is how this last result agrees with other studies that indicate the mostly rigid rotation of the corona at higher latitudes. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
