HR: 1330h
AN: SM42B-0609    [PDF]
TI: Multiple Electron \mbox{Energy-time} Dispersions Observed in the \mbox{High-latitude} Part of the Dayside Cusp Region
AU: * Tanaka, H
EM: htanaka@stp.isas.ac.jp
AF: The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, 229-8510 Japan
AU: Saito, Y
EM: saito@stp.isas.ac.jp
AF: The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, 229-8510 Japan
AU: Asamura, K
EM: asamura@stp.isas.ac.jp
AF: The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, 229-8510 Japan
AU: Mukai, T
EM: mukai@stp.isas.ac.jp
AF: The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, 229-8510 Japan
AB: Multiple electron \mbox{energy-time} dispersions (MEEDs) were observed at altitude of several hundred km in the \mbox{high-latitude} part of the dayside cusp region by a sounding rocket, which was launched on December 2000 from \mbox{Ny-\AA lesund}. The MEEDs were characterized by \mbox{field-aligned} precipitation with falling energies from 200 eV down to 20 eV at a repetition rate of $\sim $2 Hz. Their \mbox{time-of-flight} analysis resulted in the source altitude of several thousand km. With test particle simulations, these characteristics of the MEEDs can be quantitatively interpreted in terms of the resonance acceleration of electrons with \mbox{field-aligned} electric fields generated by large amplitude inertial Alfv\'{e}n waves. The Alfv\'{e}n waves might originate at the dayside magnetopause, associated with magnetic reconnection.
DE: 2451 Particle acceleration
DE: 2455 Particle precipitation
DE: 2483 Wave/particle interactions
DE: 2724 Magnetopause, cusp, and boundary layers
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting