Downstream structures of interplanetary fast shocks associated with coronal mass ejections

Details Downstream structures of interplanetary fast shocks associated with coronal mass ejections Downstream structures of interplanetary fast shocks associated with coronal mass ejections

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3212103k&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 12, CiteID L12103

Physics

11

Interplanetary Physics: Coronal Mass Ejections (7513), Interplanetary Physics: Discontinuities (7811), Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836)

Scientific paper

We investigate 17 coronal mass ejection (CME) events identified by the ACE spacecraft during solar cycle 23, focusing upon the fine structures of the sheath region between the CME and its associated shock to find their dependence on the shock parameters. We observe the planar magnetic structure (PMS) downstream of a quasi-perpendicular shock when the Alfvén Mach number >2.0. Here, the PMS is characterized by the magnetic fields changing directions abruptly and intermittently within a plane parallel to the shock plane. The downstream PMS does not form when a magnetic cloud with β value <0.05 exists just upstream of a shock with Alfvén Mach number <2.0. The sheath magnetic fields become highly turbulent when the shock angle is <60 and/or the upstream β value is >0.5 and the upstream is dominated by Alfvenic fluctuations.

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