Different Types of Ion Populations Upstream of the 2013 October 8 Interplanetary Shock

摘要

We show for the first time that different types of suprathermal ion distributions may exist upstream of a single interplanetary shock. ACE and the two ARTEMIS satellites observed a shock on 2013 October 8. The ARTEMIS P1 and P2 spacecraft first observed field-aligned ions (P1) and gyrating ions (P2) arriving from the shock. These were followed by intermediate ions and later by a diffuse population. At the location of the P2 the shock exhibited an Alfvénic Mach number of MA=5.7 and was marginally quasi-perpendicular (θ_Bn = 47°). At P1 spacecraft the shock was weaker (M_A=4.9) and more perpendicular (θ_Bn = 61°). Consequently, the observed suprathermal ion and ultra-low-frequency wave properties were somewhat different. At P2 the ultra-low-frequency waves are more intense and extend farther upstream from the shock. The energies of field-aligned and gyrating ions in the shock rest-frame were ～20 keV, which is much more than in the case of the stronger (M_A = 6–7) Earth’s bow shock, where they are less than 10 keV.