An explanation for the seasonal dependence of midlatitude sporadic E layers

Details An explanation for the seasonal dependence of midlatitude sporadic E layers An explanation for the seasonal dependence of midlatitude sporadic E layers

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11206315h&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A6, CiteID A06315

Physics

10

Ionosphere: Midlatitude Ionosphere, Ionosphere: Ionosphere/Atmosphere Interactions (0335), Ionosphere: Ion Chemistry And Composition (0335), Ionosphere: Ionization Processes (7823), Ionosphere: Meteor-Trail Physics

Scientific paper

The midlatitude sporadic E layers form when metallic ions of meteoric origin in the lower thermosphere are converged vertically in a wind shear. The occurrence and strength of sporadic E follow a pronounced seasonal dependence marked by a conspicuous summer maximum. Although this is known since the early years of ionosonde studies, its cause has remained a mystery as it cannot be accounted for by the windshear theory ofE s formation. We show here that the marked seasonal dependence of sporadic E correlates well with the annual variation of sporadic meteor deposition in the upper atmosphere. The later has been established recently from long-term measurements using meteor radar interferometers in the Northern and Southern Hemispheres. Knowing that the occurrence and strength of sporadic E layers depends directly on the metal ion content, which apparently is determined primarily by the meteoric deposition, the present study offers a cause-and-effect explanation for the long-going mystery of sporadic E layer seasonal dependence.

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