Statistical Study of the Time Duration of the ICME Sheath

Details Statistical Study of the Time Duration of the ICME Sheath Statistical Study of the Time Duration of the ICME Sheath

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23b1854n&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH23B-1854

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections

Scientific paper

The mean objective of this work is to characterize the time duration of the sheath of the Interplanetary Coronal Mass Ejections (ICME's) observed in situ at one astronomical unit. In order to identify the sheath initial and final times, we determine the fluctuations of different parameters of the ICME's as velocity, magnetic field, temperature, density, etc. The time duration of the sheath was defined as the time where the fluctuations exceeded twice the standard deviation magnitude. We compared our results with the times reported in previous works. We found that these times were comparable. We analyzed 49 events observed by WIND and ACE during the 2000 to 2005 period. We present the statistical analysis of these events and the discussion of our results. With this method we are proposing a way to determine systematically (independently of the observer) the duration of the ICME sheath.

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