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Calculated effects of traveling sporadic E on nocturnal ELF propagation: Comparison with measurement
Author(s) -
Pappert Richard A.
Publication year - 1985
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs020i002p00229
Subject(s) - transmitter , great circle , ionosphere , shadow (psychology) , homogeneous , geodesy , radio propagation , phase (matter) , physics , telecommunications , meteorology , geology , optics , geography , computer science , geophysics , psychology , channel (broadcasting) , astronomy , psychotherapist , thermodynamics , quantum mechanics
A simple surface propagation model has been used to estimate the effects of a moving cylindrically symmetric, homogeneous, patch of sporadic E on propagation in the lower ELF band. Emphasis is on comparison with simultaneous Connecticut and North‐Atlantic reception of transmissions from the Wisconsin Test Facility (WFT) where nighttime propagation anomalies occurred 2–4 hours apart (Bannister, 1982). Ionospheric disturbances, travelling with a speed of order 100 km/hr and moving out of the geographic North‐Northwest, which cross both transmitter‐receiver great circle paths in such a way that they shadow the transmitter are found to be the most likely candidates for causing the delayed fades. Likely paths yield phase behavior which is in qualitative agreement with measurement. Patches with radii ≳0.5 Mm are required for the deepest fades.