Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses

Details Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11704210v&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A4, CiteID A04210

Physics

Interplanetary Physics: Coronal Mass Ejections (4305, 7513), Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Interplanetary Shocks, Space Weather: Magnetic Storms (2788)

Scientific paper

Interplanetary (IP) shocks are mainly responsible for the sudden compression of the magnetosphere, causing storm sudden commencement (SC) and sudden impulses (SIs) which are detected by ground-based magnetometers. On the basis of the list of 222 IP shocks compiled by Gopalswamy et al. (2010), we have investigated the dependence of SC/SIs amplitudes on the speed of the coronal mass ejections (CMEs) that drive the shocks near the Sun as well as in the interplanetary medium. We find that about 91% of the IP shocks were associated with SC/SIs. The average speed of the SC/SI-associated CMEs is 1015 km/s, which is almost a factor of 2 higher than the general CME speed. When the shocks were grouped according to their ability to produce type II radio burst in the interplanetary medium, we find that the radio-loud (RL) shocks produce a much larger SC/SI amplitude (average ∼32 nT) compared to the radio-quiet (RQ) shocks (average ∼19 nT). Clearly, RL shocks are more effective in producing SC/SIs than the RQ shocks. We also divided the IP shocks according to the type of IP counterpart of interplanetary CMEs (ICMEs): magnetic clouds (MCs) and nonmagnetic clouds. We find that the MC-associated shock speeds are better correlated with SC/SI amplitudes than those associated with non-MC ejecta. The SC/SI amplitudes are also higher for MCs than ejecta. Our results show that RL and RQ type of shocks are important parameters in producing the SC/SI amplitude.

Affiliated with

Also associated with

No associations

Rating

Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses 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 Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coronal mass ejection–driven shocks and the associated sudden commencements/sudden impulses will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1118837