Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010107w&link_type=abstract
Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10107
Physics
24
Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Solar Cycle Variations (7536), Interplanetary Physics: Coronal Mass Ejections (7513), Interplanetary Physics: Solar Wind Plasma
Scientific paper
We identify and characterize interplanetary coronal mass ejections (ICMEs) observed by spacecraft in the solar wind, namely Helios 1 and 2, PVO, ACE, and Ulysses, which together cover heliocentric distances from 0.3 to 5.4 AU. The primary identification signature used to look for ICMEs is abnormally low proton temperatures. About 600 probable ICMEs were identified from the solar wind plasma and magnetic field data from these spacecraft. We use these events to study the radial evolution of ICMEs between 0.3 and 5.4 AU, mainly in a statistical sense. The occurrence rate of ICME approximately follows the solar activity cycle. ICMEs expand as they move outward since the internal pressure is generally larger than the external pressure. The average radial width of ICMEs increases with distance. ICMEs expand by a factor of 2.7 in radial width between 1 and 5 AU. The radial expansion speed of ICMEs decreases with distance and is of the order of the Alfvén speed. The density and magnetic field magnitude decrease faster in ICMEs, which fall off with distance R as R-2.4 and R-1.5, respectively, than in the ambient solar wind; however, the temperature decreases as R-0.7, slightly less rapid than in the ambient solar wind. These results are consistent with previous findings with relatively limited data coverage. We also use a one-dimensional MHD model to investigate the radial expansion of the ICMEs and find that the radial expansion speed is of the order of the Alfvén speed, consistent with the observations.
Du Dongsheng
Richardson John D.
Wang Chenjie
No associations
LandOfFree
Characteristics of the interplanetary coronal mass ejections in the heliosphere between 0.3 and 5.4 AU does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Characteristics of the interplanetary coronal mass ejections in the heliosphere between 0.3 and 5.4 AU, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Characteristics of the interplanetary coronal mass ejections in the heliosphere between 0.3 and 5.4 AU will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1365462