Interplanetary coronal mass ejections in the near-Earth solar wind during 1996-2002

Details Interplanetary coronal mass ejections in the near-Earth solar wind during 1996-2002 Interplanetary coronal mass ejections in the near-Earth solar wind during 1996-2002

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1156c&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A4, pp. SSH 6-1, CiteID 1156, DOI 10.1029/2002JA009817

Astronomy and Astrophysics

Astrophysics

157

Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Cycle Variations (7536)

Scientific paper

We summarize the occurrence of interplanetary coronal mass ejections (ICMEs) in the near-Earth solar wind during 1996-2002, corresponding to the increasing and maximum phases of solar cycle 23. In particular, we give a detailed list of such events. This list, based on in situ observations, is not confined to subsets of ICMEs, such as ``magnetic clouds'' or those preceded by ``halo'' coronal mass injections (CMEs) observed by the Solar and Heliospheric Observatory/Large Angle and Spectrometric Coronagraph, and provides an overview of 214 ICMEs in the near-Earth solar wind during this period. The ICME rate increases by about an order of magnitude from solar minimum to solar maximum (when the rate is ~3 ICMEs per solar rotation period). The rate also shows a temporary reduction during 1999 and another brief, deeper reduction in late 2000 to early 2001, which only approximately track variations in the solar 10-cm flux. In addition, there are occasional periods of several rotations duration when the ICME rate is enhanced in association with high solar activity levels. We find an indication of a periodic variation in the ICME rate, with a prominent period of ~165 days similar to that previously reported in various solar phenomena. It is found that the fraction of ICMEs that are magnetic clouds has a solar cycle variation, the fraction being larger near solar minimum. For the subset of events that we could associate with a CME at the Sun the transit speeds from the Sun to the Earth were highest after solar maximum.

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