`Cosmic-ray-mediated' interplanetary shocks in 1994 and 2003
Abstract
All astrophysically significant shocks, such as supernova shocks, are believed to be so effective in accelerating nonthermal particles (`cosmic rays') that these cosmic rays modify the shock structure nonlinearly (`cosmic-ray-mediated shock' (CRMS) feature). However, direct observational evidence of CRMS has been limited to the earth's bow shock and one interplanetary shock (IPS) observed at the end of the previous solar cycle (21 February 1994). Recently, a series of strong solar events in October-November 2003 produced several fast IPSs, for one of which (IPS on 29 October 2003) we have identified a weak CRMS feature. We will make a comparative study on the CRMS features between the 1994 and 2003 IPSs, and try to see how they depend on the shock parameters, such as Mach number and shock angle.
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35.3288T