Observations of the magnetic fluctuation enhancement in the Earth's foreshock region

Journal Article · Fri Jun 01 04:00:00 UTC 1990 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL017i007p00905· OSTI ID:6785089

Le, G; Russell, C T ^[1]

---

1. Univ. of California, Los Angeles (USA)

Upstream waves have been postulated to be a major source of energy for the dayside magnetic pulsations within the magnetosphere. Thus it is of interest to determine over what frequency range in the ion foreshock the power of fluctuations in the solar wind is enhanced. The authors have examined the magnetic field data from pairs of spacecraft when they are on either side of the ion fore-shock boundary. They find that the power of magnetic fluctuations is enhanced only at periods less than about two minutes, not at longer periods. Thus the upstream waves may contribute to Pc 3 and Pc 4 pulsations in the dayside magnetosphere, but they can not be directly responsible for the longer period waves.

• OSTI ID: 6785089
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:7; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

640201* -- Atmospheric Physics-- Auroral
Ionospheric
& Magetospheric Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
ENERGY SOURCES
FLUCTUATIONS
MAGNETIC FIELDS
MAGNETOPAUSE
PULSATIONS
SATELLITES
SHOCK WAVES
SOLAR ACTIVITY
SOLAR WIND
VARIATIONS