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- W2060895978 abstract "VHF radar data from the Summer 1990 Equatorial Spread F campaign on Kwajalein are presented. The Cornell 50 MHz portable radar interferometer (CUPRI) operated concurrently with the Altair UHF incoherent scatter radar throughout July and August and supported two sounding rocket flights on July 30 and August 2. This experiment provided the first opportunity to simultaneously diagnose equatorial spread F using the three prime experimental techniques: VHF/UHF coherent scatter, incoherent scatter, and in situ probe measurements of electric field and density fluctuations. The intensity of the coherent echoes observed was consistent with typical Jicamarca spread F observations, but chains of periodic, large‐scale plasma upwellings were observed more often and for much longer durations on Kwajalein than have been seen over Peru. CUPRI also measured Doppler frequencies in one upwelling corresponding to 1200‐m/s plasma drift velocities. This measurement agrees with recent observations of supersonic drift rates at the magnetic equator by spacecraft. Near the most active localized plasma upwellings, interferometer data reveal that the zonal drift rate of plasma irregularities can vary sharply in space, as one would expect for two‐dimensional incompressible flow. We introduce a semiempirical model of the three‐dimensional spectrum of F region irregularities that is consistent with the one‐dimensional spectra of density fluctuations observed by sounding rockets and with the axial ratio of irregularities determined recently. Normalized to data from one of the rocket flights on Kwajalein, the model predicts the 3‐m scattering cross‐section measured by CUPRI to within a few decibels." @default.
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- W2060895978 date "1994-08-01" @default.
- W2060895978 modified "2023-10-17" @default.
- W2060895978 title "VHF radar and rocket observations of equatorial spread <i>F</i> on Kwajalein" @default.
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- W2060895978 doi "https://doi.org/10.1029/94ja00476" @default.
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