GEOMAGNETIC NOISE 0.005 TO 5 CPS IN BERMUDA, VOLUME I.
Abstract
Vertical components of the geomagnetic noise field in the frequency range 0.005 to 5 cps were recorded continuously at a shore location on Cedar Hill, Southampton, Bermuda. The instru mentation was based on laminated-core loop antennas. The N-S component in Rochester, New York was recorded simultaneously. The major re sults are as follows. (a) The vertical component at the Bermuda site was found to be the same order of magnitude as the horizontal components; the discontinuity in conductivity at the island shoreline accounts for this property. (b) Major features in the signal appeared simultaneously in Rochester and Bermuda with essentially no dif ference in waveform. (c) The vertical component in Bermuda showed excellent waveform correlation with the N-S component, with the vertical lagging the N-S by about 15 deg. in phase. (d) The E-W component displayed much poorer waveform correla tion with N-S, with a highly variable phase lag amounting on the average to about 65 deg. (e) This waveform anisotropy was reflected in the33ower spectra of the various components. (f) Ex tensive power spectrum analysis of Pc waveforms showed them to be variable in structure, with the major quasisinusoidal component actually com posed of a mass of complicated fine structure. A model representing the data in terms of incoming longitudinal ordinary hydromagnetic waves is pre sented; this model accounts qualitatively for the phase and amplitude anisotropy observed in the data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0426711
Entities
People
- Delmer G. Parker
- Raymond A. Santirocco
Organizations
- General Dynamics