Solar sources and geospace consequences of interplanetary magnetic clouds observed during solar cycle 23

Details Solar sources and geospace consequences of interplanetary magnetic clouds observed during solar cycle 23 Solar sources and geospace consequences of interplanetary magnetic clouds observed during solar cycle 23

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70..245g&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, vol. 70, issue 2-4, pp. 245-253

Physics

29

Coronal Mass Ejections, Magnetic Clouds, Space Weather, Solar Cycle

Scientific paper

We present results of a statistical investigation of 99 magnetic clouds (MCs) observed during 1995-2005. The MC-associated coronal mass ejections (CMEs) are faster and wider on the average and originate within ±30o from the solar disk center. The solar sources of MCs also followed the butterfly diagram. The correlation between the magnetic field strength and speed of MCs was found to be valid over a much wider range of speeds. The number of south-north (SN) MCs was dominant and decreased with solar cycle, while the number of north-south (NS) MCs increased confirming the odd-cycle behavior. Two-thirds of MCs were geoeffective; the Dst index was highly correlated with speed and magnetic field in MCs as well as their product. Many (55%) fully northward (FN) MCs were geoeffective solely due to their sheaths. The non-geoeffective MCs were slower (average speed ), had a weaker southward magnetic field (average ), and occurred mostly during the rise phase of the solar activity cycle.

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