Kilometer-Scale Layered Structures Inside Spread-F

Details Kilometer-Scale Layered Structures Inside Spread-F Kilometer-Scale Layered Structures Inside Spread-F

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4167m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 22, p. 4167-4170

Physics

11

Ionosphere: Ionospheric Irregularities, Ionosphere: Midlatitude Ionosphere, Ionosphere: Plasma Waves And Instabilities

Scientific paper

We report the first incoherent scatter radar observations-made at Arecibo Observatory-of remarkable bottom-side (<280 km) F-region sheet-like plasma structures with horizontal/vertical-scales of <~1 km. These structures are an apparent manifestation of spread-F, appear to give rise to VHF coherent (FAI) scattering, and are clearly electrodynamic in origin involving a form of the Perkins spread-F instability process in the presence of relatively large E-fields and horizontal plasma gradients. The net instability process appears to be associated with downwelling features characteristic of the nighttime F-region. These structures-that may be self-similar on scales of ~1-100 km-indicate considerable electrodynamic activity in the mid-latitude F-region on scales that have profound space-weather implications especially regarding deep scintillations on earth-space communications links.

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