HR: 15:40h
AN: SA53C-07    [Abstracts]
TI: The Future of HF-Interaction Experiments at EISCAT
AU: * Rietveld, M T
EM: mike.rietveld@eiscat.uit.no
AF: EISCAT Scientific Association, Tromso, Ramfjordbotn, 9027, Norway
AB: The EISCAT HF facility, co-located with two incoherent scatter radars, has some of the best diagnostics available for doing research in plasma physics and actively probing the ionosphere, upper atmosphere and magnetosphere. The facility is presently undergoing some improvements which will keep it at the forefront of such research. Direct digital synthesis of the HF wave will allow fast changes of frequency and beam direction, and increased flexibility in pulsing. Some of the more important recent results are outlined, and the directions for further progress are suggested. These results include the effect of electron heating on the charging of mesospheric dust which changes the strength of VHF radar echoes from the polar summer mesosphere. Other results involve Langmuir and thermal plasma instabilities from the F region which show a rich variety of dependences on pumping frequency and direction to the Earth's magnetic field. Some of the geometrical effects observed in plasma line observations and artificial optical emissions remain largely unexplained.
DE: 2403 Active experiments
DE: 2439 Ionospheric irregularities
DE: 2461 Plasma interactions with dust and aerosols (7849)
DE: 2471 Plasma waves and instabilities (2772)
DE: 6944 Nonlinear phenomena (4400, 7839)
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly