Ion burst event in the earth's dayside magnetosheath

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Geophysical Research Letters (American Geophysical Union); (United States)

DOI:https://doi.org/10.1029/91GL00140· OSTI ID:5995348

Paschalidis, N P ^[1]; Krimigis, S M; Sibeck, D G; McEntire, R W; Zanetti, L J ^[2]; Sarris, E T ^[3]; Christon, S P ^[4]

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1. Johns Hopkins Univ., Laurel, MD (United States) Demokritos Univ. of Thrace, Xanthi (Greece)
2. Johns Hopkins Univ., Laurel, MD (United States)
3. Demokritis Univ. of Thrace, Xanthi (Greece)
4. Univ. of Maryland, College Park (United States)

The MEPA instrument on the AMPTE/CCE Spacecraft provided ion angular distributions as rapidly as every 6 sec for H, He, and O at energies of 10 keV to 2 MeV in the dayside magnetosheath within 8.75 R{sub E}, the CCE apogee. In this report the authors discuss a burst of energetic particles in the subsolar magnetosheath and its association with rapid changes in the local magnetic field direction in such a way that the magnetic field connected the spacecraft to the magnetopause during the enhancement. They find that magnetosheath angular distributions outside the burst peaked at 90{degree} pitch angles, whereas during the burst they exhibited field aligned streaming either parallel or antiparallel to the magnetic field combined with a clear earthward gradient. The clear earthward gradients at E {ge} 10 KeV, the streaming, and the slope change in the burst-time magnetosheath spectrum at {approximately}10 KeV suggest magnetospheric source for the burst-time {ge} 10 KeV ions and heated solar wind for E < 10 KeV.

• OSTI ID: 5995348
• Journal Information: Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 18:3; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
&amp; Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR DISTRIBUTION
CHARGED PARTICLES
COMPRESSION
DATA ANALYSIS
DISTRIBUTION
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
HELIUM IONS
HYDROGEN IONS
ION DENSITY
ION DRIFT
IONS
MAGNETOPAUSE
MAGNETOSHEATH
OXYGEN IONS
PLASMA PRESSURE
SATELLITES
SOLAR ACTIVITY
SOLAR WIND