What causes geomagnetic activity during sunspot minimum

• Published in: arXiv.org
• Main Authors: Kirov, Boian, Asenovski, Simeon, Georgieva, Katya, Obridko, Vladimir
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 02.12.2014
• Subjects: Coronal holes; Coronal mass ejection; Disturbances; Geomagnetism; High speed; Magnetic fields; Parameters; Physics - Space Physics; Solar corona; Solar wind; Streams; Sunspots

The average geomagnetic activity during sunspot minimum has been continuously decreasing in the last four cycles. The geomagnetic activity is caused by both interplanetary disturbances - coronal mass ejections and high speed solar wind streams, and the background solar wind over which these disturba...