On a summer maximum in the occurrence frequency of 150 km (F1) radar echoes over Pohnpei

Details On a summer maximum in the occurrence frequency of 150 km (F1) radar echoes over Pohnpei On a summer maximum in the occurrence frequency of 150 km (F1) radar echoes over Pohnpei

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106810t&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06810

Other

6

Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Dynamics, Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Waves And Instabilities

Scientific paper

Using three and a half years of 50 MHz radar data collected from Pohnpei, Federated States of Micronesia (6.96°N, 158.19°E geographic, 0.3° magnetic dip latitude), we show for the first time that the occurrence frequency of 150 km (or F1) echoes has a broad but conspicuous maximum during northern summer in this longitude sector with minimal activity in other months. Given a seasonal similarity to sporadic E (Es), we suggest that an Es-layer instability [Cosgrove and Tsunoda, 2002] generates a polarization electric field ($\vec E$), which maps along geomagnetic field lines to the F1 region. There, $\vec E$ forms thin plasma sheets that provide gradients to excite 3-m-scale plasma waves via an interchange process.

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