Physics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41...65s&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 41, Jan. 1979, p. 65-75.
Physics
2
Geomagnetic Micropulsations, Magnetic Resonance, Midlatitude Atmosphere, Auroral Electrojets, Auroral Zones, Energy Sources, Graphs (Charts), Spectrum Analysis
Scientific paper
An established feature of Pi2 morphology is the so-called secondary amplitude maximum that occurs at midlatitudes. In this paper, Pi2's recorded at a N-S array of stations between L = 3.8 and L = 2.4 in the U.K. are examined in relation to the secondary amplitude maximum occurring at midlatitudes with a view toward locating the energy source for midlatitude Pi2's and resolving the conflicting interpretations as to the location of the region of 'secondary resonance'. A field line resonance theory is used to order a large number of the events into two groups representing resonance inside and outside the plasmasphere, respectively. The characteristics of these two groups are (1) Group I - resonance north of Lerwick, postmidnight, short period which is independent of geomagnetic activity; and (2) Group III - resonance south of Lerwick, premidnight, longer period which decreases with increasing geomagnetic activity. Only three events are classified as resonances near Lerwick (Group II). Ionospheric electric fields rather than magnetospheric conditions may control the localization of the events.
Brett P. M.
Harris Terry J.
Stuart W. F.
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