Hydromagnetic (ULF) power at separated sites (Delta-Phi about 90 deg) at mid- to low-latitudes

Details Hydromagnetic (ULF) power at separated sites (Delta-Phi about 90 deg) at mid- to low-latitudes Hydromagnetic (ULF) power at separated sites (Delta-Phi about 90 deg) at mid- to low-latitudes

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37.1385v&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Nov. 1989, p. 1385-1391. Research supported by MPI.

Computer Science

2

Extremely Low Radio Frequencies, Low Altitude, Magnetohydrodynamic Waves, Midlatitude Atmosphere, Space Plasmas, Cross Correlation, Earth Magnetosphere, Earth Surface, Geosynchronous Orbits

Scientific paper

The power spectra of geomagnetic field fluctuations in the hydromagnetic waveband of periods 20-600 s have been systematically evaluated from data acquired at L'Aquila, Italy (geomagnetic invariant longitude Phi = 94.4 deg; invariant latitude Lambda is about 42.5 deg; L is about 1.6) and Green Hill, R.I. (Phi = 5 deg; Lambda is about 52 deg; L is about 2.8) during July 1985. The average levels of the ULF power in different frequency bands have been compared. Autocorrelations of power levels for the data at the two stations show a clear 24-h recurrence period at L'Aquila in the bands 20-30 s and 30-45 s, while the same periodicity is clearly observed at Green Hill for the 30-45 s and 45-150 s bands. The results of the cross-correlation analysis of the data from the two stations indicate that there is a clear UT dependence for geomagnetic power for periods between 45 and 600 s, suggesting global source influences on the power levels. The power in the period band 30-45 s appears to be better correlated on an LT basis suggesting a similar diurnal pattern at the two stations of the 24-h modulation in this range of frequency.

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