Relationship of meteors to sporadic E. I - A sorting of facts. II - Statistical evidence for class 1 Em

Details Relationship of meteors to sporadic E. I - A sorting of facts. II - Statistical evidence for class 1 Em Relationship of meteors to sporadic E. I - A sorting of facts. II - Statistical evidence for class 1 Em

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.6131e&link_type=abstract

Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 6131-6140.

Physics

3

Atmospheric Physics, Meteor Trails, Meteoroid Showers, Midlatitude Atmosphere, Sporadic E Layer, Annual Variations, Diurnal Variations, Echoes, Ionosondes, Radar Measurement, Temperate Regions

Scientific paper

The existing confusion about the relation between meteors and sporadic E is resolved by identifying three classes of meteor-produced sporadic E. Class I is the instantaneous partially reflecting ionosonde echo due to a single meteor trail. Class II defines the cases where meteor occurrence is of sufficient strength to produce control of sporadic E frequency on the simultaneous ionogram. Class III is the production of sporadic E layers by the subsequent action of wind shear on residual meteor ion concentrations. Class II is a rare occurrence and has accounted for much of the ambiguity where direct relations have been sought between meteor rate and sporadic E occurrence. A major conclusion that emerges is that much temperate zone sporadic E, but not necessarily all, is due to meteor ions subsequently concentrated by the wind shear mechanism. The meteor influx does not appear to be the most important factor controlling class III sporadic E formation; the major controlling factor is the variation in the average zonal wind system. Graphical and statistical comparisons are made between the occurrence of approximately 1400 examples of a certain type of sporadic E, termed Class 1 Em (where Em stands for meteor-induced sporadic E), and 724,681 radar meteors observed simultaneously at 69.5 MHz over a period of 1 year.

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