A LUNAR EFFECT IN THE OCCURRENCE OF CONJUGATE ECHOES ON TOPSIDE SOUNDER IONOGRAMS

Authors
  1. Sharma, R.P.
  2. Muldrew, D.B.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN)
Abstract
Radio waves, transmitted by the Alouette 2 and Isis 1 satellites, can become trapped in magnetic field aligned ionization ducts, which can extend between the northern and southern hemispheres of the earth. In a set of data containing 1.8 x 10 to the 5th power ionograms recorded at five low-latitude telemetry stations from December 1965 to November 1971, conjugate echoes were observed on 4.5% of the ionograms. The semimonthly variation probably indicates that lunar tidal induced electric fields in the dynamo region have some influence in the production or duration of conjugate ducts; it is surprising, however, that no lunar diurnal or semidiurnal variation in occurence frequency of conjugate ducts was found.
Date of publication
01 Jan 1973
Number of Pages
10
Reprinted from
J of Geophysical Research, vol 78, no 34, 1973, p 8251-8260
DSTKIM No
74-04243
CANDIS No
23638
Format(s):
Hardcopy

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