Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..727p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, June 1984, p. 727-734.
Physics
27
Diurnal Variations, Geomagnetic Micropulsations, Midlatitude Atmosphere, Plasmasphere, Very Low Frequencies, Atmospheric Models, Eigenvalues, Plasma Density, Positive Ions, Vertical Distribution
Scientific paper
Magnetometer studies of the periods of midlatitude ULF pulsations have produced conflicting results on the variation of the pulsation periods with both latitude and local time. Since the midlatitude geomagnetic field is not expected to be significantly distorted by the solar wind, the observed diurnal period variations should be determined by changes in the ambient plasma density. A physically realistic plasmasphere model has been applied to the determination of pulsation eigenperiods over a 24-h interval at L = 2.3 (appropriate to Wellington, New Zealand). The resulting model pulsation eigenperiods are largest during the day, with minimum and maximum values at 05.00 and 18.00 L.T. respectively. The model predicts a general increase in the eigenperiods during the replenishment of the protonosphere after a period of geomagnetic activity.
Allan W.
Bailey Graham J.
Moffett R. J.
Poulter E. M.
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