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First results from wideband (electron phase energies of 5–51 eV), high-resolution (0.1 eV) spectral measurements of photoelectron–enhanced plasma lines made with the 430 MHz radar at Arecibo Observatory are presented. In the F region, photoelectrons produced by solar EUV line emissions (He II and Mg IX) give rise to plasma line spectral peaks/valleys. These and other structures occur within an enhancement...
The NASA DS1 spacecraft encountered Comet P/Borrelly on September 22, 2001 at a distance of ~2171 km on the sunward side of the comet. The flyby speed was ~16.5 kms -1 . Using high temporal resolution (50 μs) absolute electric field amplitude measurements from a ~1 m dipole antenna, new features of plasma clouds created by cometary dust impacts have been detected. The pulses have 1/e...
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