ULF geomagnetic power at cusp latitudes in response to upstream solar wind conditions

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JA092iA01p00168· OSTI ID:5940171

Wolfe, A; Kamen, E ^[1]; Lanzerotti, L J; Maclennan, C G ^[2]; Bamber, J F ^[3]; Venkatesan, D ^[4]

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1. City Univ. of New York, NY (United States) AT and T Bell Lab., Murray Hill, NJ (United States)
2. AT and T Bell Lab., Murray Hill, NJ (United States)
3. AT and T Bell Lab., Murray Hill, NJ (United States) Univ. of Calgary, Alberta (Canada)
4. Univ. of Calgary, Alberta (Canada)

Energy densities are computed for geomagnetic field fluctuations in the Pc 3-4 range using H component magnetometer data recorded at South Pole station over a three-month period from June 3 to September 4, 1982. Hourly values of the energy densities in the Pc 3 and Pc 4 period bands are found to be highly correlated during geomagnetic local daytime hours. The results of multivariate analyses between geomagnetic energies and upstream solar wind quantities show that the most important quantity in controlling the magnitude of the field fluctuations is the solar wind speed, with the IMF B{sub z} component being of next importance. The authors conclude that the Kelvin-Helmholtz instability at the dayside magnetopause is, statistically, the dominant energy source that contributes to ULF hydromagnetic wave activity at cusp latitudes.

• OSTI ID: 5940171
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 92:A1; ISSN JGREA; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CORRELATIONS
ENERGY DENSITY
FLUCTUATIONS
GEOMAGNETIC FIELD
HELMHOLTZ INSTABILITY
HYDROMAGNETIC WAVES
INSTABILITY
INTERPLANETARY MAGNETIC FIELDS
MAGNETIC FIELDS
MATHEMATICS
MULTIVARIATE ANALYSIS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
POLAR CUSP
SOLAR ACTIVITY
SOLAR WIND
STATISTICS
VARIATIONS