Spread-F and the latitude variation of occurrence of whistlers

Singleton D.G. (1961) Spread-F and the latitude variation of occurrence of whistlers. Nature, 189 4760: 215-216. doi:10.1038/189215a0


Author Singleton D.G.
Title Spread-F and the latitude variation of occurrence of whistlers
Journal name Nature   Check publisher's open access policy
ISSN 0028-0836
Publication date 1961
Sub-type Article (original research)
DOI 10.1038/189215a0
Volume 189
Issue 4760
Start page 215
End page 216
Total pages 2
Subject 1000 General
Abstract RECENT work of whistling atmospherics has suggested that the incidence of the phenomenon is dependent on latitude. Crouchley1, using data from Australian and Japanese stations, demonstrated that whistler activity reaches a maximum at about 45°geomagnetic latitude, while the Stanford group 2 report a maximum of occurrence at 50°geomagnetic latitude. In both these reports a marked decrease in activity at lower and higher latitudes is noted. The decreasing incidence at higher latitudes has been attributed 3 to decreasing thunderstorm activity, and rapidly increasing path-length and absorption with increasing latitude. However, the fall-off in activity at low latitudes cannot be so explained. Smith, Helliwell and Yabroff3 have suggested an explanation of this low-latitude fall-off in terms of whistler propagation within field-aligned ducts. They showed that the necessary ionization enhancement within the ducts for F-layer heights falls off markedly with increasing latitude and argue, therefore, that this suggests that whistler occurrence should increase with latitude, since large enhancements would be expected to occur less frequently than small enhancements. It is the purpose of this communication to examine this point in more detail.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Created: Tue, 26 Jul 2016, 04:08:40 EST by System User