Journal
EARTH PLANETS AND SPACE
Volume 69, Issue -, Pages -Publisher
SPRINGER HEIDELBERG
DOI: 10.1186/s40623-017-0653-z
Keywords
Geomagnetic storm; Rising and maximum phases; Two peaks; Solar cycle 24; Coronal mass ejection; Coronal hole
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Funding
- JSPS KAKENHI [15H05815]
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Solar activity of cycle 24 following the deep minimum between cycle 23 and cycle 24 is the weakest one since cycle 14 (1902-1913). Geomagnetic activity is also low in cycle 24. We show that this low geomagnetic activity is caused by the weak dawn-to-dusk solar wind electric field (Ed-d) and that the occurrence rate of Ed-d > 5 mV/m decreased in the interval from 2013 to 2014. We picked up seventeen geomagnetic storms with the minimum Dst index of less than - 100 nT and identified their solar sources in cycle 24 (2009-2015). It is shown that the relatively slow coronal mass ejections contributed to the geomagnetic storms in cycle 24.
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