Geomagnetic storms of cycle 24 and their solar sources
| Autor: | Shinichi Watari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Solar minimum
Geomagnetic storm 010504 meteorology & atmospheric sciences lcsh:Geodesy Solar cycle 23 Solar cycle 22 Two peaks Atmospheric sciences 01 natural sciences 0103 physical sciences 010303 astronomy & astrophysics 0105 earth and related environmental sciences Physics lcsh:QB275-343 lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Solar cycle 12 Geology Solar cycle 11 Solar cycle 10 Coronal hole lcsh:Geology lcsh:G Space and Planetary Science Solar cycle 16 Solar cycle 24 Coronal mass ejection May 1921 geomagnetic storm Rising and maximum phases |
| Zdroj: | Earth, Planets and Space, Vol 69, Iss 1, Pp 1-8 (2017) |
| ISSN: | 1880-5981 |
| DOI: | 10.1186/s40623-017-0653-z |
| Popis: | 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 (E d–d) and that the occurrence rate of E d–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. |
| Databáze: | OpenAIRE |
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