Statistics – Computation
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.5681r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A4, p. 5681-5689
Statistics
Computation
17
Earth Magnetosphere, Harmonic Radiation, Line Spectra, Very Low Frequencies, Computational Grids, Fourier Transformation, Isis Satellites, Spectrographs, Temporal Resolution
Scientific paper
VLF line radiation recieved by the ISIS 1 and 2 satellites over New Zealand is found to fall into two distinct classes. The first of these consists of magnetospheric lines (MLs) which are characterized by a broadband appearance and by frequency drifts of a few tens of hertz per minute, similar to those reported elsewhere. Both their initial frequencies and their frequency spacings were, however, found to be esentially random rather than multiples of 50 or 60 HZ. The hourly variation in ML occurrence showed no correlation with electric load in possible electric mainstream sources. No clear decrease in occurrence on weekends was evident. The first satellite survey with significant numbers of MLs found no evidence of a relationship with power line harmonics. The second class of satellite-received VLF lines consisted of tram lines (TLs) which are characterized by their very narrow bandwidth and zero frequency drift. TLs appear to lie close to harmonics of 50 or 60 HZ. An example of this class is presented.
Dowden Richard L.
Rodger Craig J.
Thomson Neil. R.
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