Multiple-Harmonic ULF waves in the Plasma Sheet Boundary Layer Observed by Cluster

Details Multiple-Harmonic ULF waves in the Plasma Sheet Boundary Layer Observed by Cluster Multiple-Harmonic ULF waves in the Plasma Sheet Boundary Layer Observed by Cluster

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm33a..01k&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM33A-01

Physics

2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2752 Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

The passage of the Cluster satellites in a polar orbit through Earth's magnetotail has provided numerous observations of harmonically related Pc 1-2 ULF wave events, with the fundamental near the local proton cyclotron frequency. Broughton et al. [JGR 2008] reported observations by Cluster of three such events in the plasma sheet boundary layer, and used the wave telescope technique to determine wave propagation nearly perpendicular to B0. We report here on a survey of the entire set of Cluster observations in Earth's magnetotail during 2003: 34 harmonically related wave events were observed during 13 of the 42 tail passes of Cluster from July 22 to October 28. Event durations were commonly < 5 min, but ranged up to 40 min. Wave events were distributed rather evenly from -7 RE out to the Cluster apogee distance of -18 RE, with one event also observed at X = -4 RE. The distribution in the YGSE coordinate was also rather even but asymmetric, between -9 and + 17 RE. Events occurred for ZGSE values from -10 to -3 RE and +3 to +7 RE; i.e., none was observed for |Z| < 3 RE. Each wave event was associated with signatures of the PSBL in the CIS instrument: elevated fluxes of ions with energies from 1 keV to over 30 keV, and highly variable, often counterstreaming ion velocities.

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