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FIELD-ALIGNED IRREGULARITIES IN THE ES REGION
QUEENSLAND UNIV BRISBANE (AUSTRALIA)
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A comparison of the known diurnal and seasonal behavior of constant height E sub sc AND SEQUENTIAL E sub ss sporadic-E echoes with that of field-aligned E sub d echoes from the E-region indicated that an increase in occurrence of E sub d echoes generally coincided with an increase in occurrence andor range spreading of E sub sc echoes, but was independent of the presence of E sub ss echoes. A detailed comparison indicated that at night in October and in day- and night-time in December almost all E sub sc clouds detected at frequencies at least down to 2.5 Mcs have irregularities which are field-aligned. Author
APPROVED FOR PUBLIC RELEASE