HR: 0800h
AN: SA21C-0374    [Abstracts]
TI: Evidence of Naturally Occurring Wave-Wave Interactions in the Polar Ionosphere and its Relation to Naturally Enhanced Ion Acoustic Lines
AU: * Str{\o}mme, A
EM: anja@esr.eiscat.no
AF: Department of Physics, University of Troms{\o}, Troms{\o}, 9037 Norway
AU: * Str{\o}mme, A
EM: anja@esr.eiscat.no
AF: EISCAT Scientific Association, Box 432, Longyearbyen, 9171 Norway
AU: Belyey, V
EM: vasyl@phys.uit.no
AF: Department of Physics, University of Troms{\o}, Troms{\o}, 9037 Norway
AU: Grydeland, T
EM: tom@phys.uit.no
AF: Department of Physics, University of Troms{\o}, Troms{\o}, 9037 Norway
AU: La Hoz, C
EM: cesar@phys.uit.no
AF: Department of Physics, University of Troms{\o}, Troms{\o}, 9037 Norway
AU: La Hoz, C
EM: cesar@phys.uit.no
AF: Earth and Atmospheric science, Cornell University, Ithaca, NY 14853 United States
AU: L{\o}vhaug, U
EM: unni@phys.uit.no
AF: Department of Physics, University of Troms{\o}, Troms{\o}, 9037 Norway
AU: L{\o}vhaug, U
EM: unni@phys.uit.no
AF: Centre for Geospace studies, SRI International, Menlo Park, CA 94025 United States
AU: Isham, B
EM: brett.isham@eiscat.uit.no
AF: EISCAT Scientific Association, Box 432, Longyearbyen, 9171 Norway
AB: In this paper we present the first observational evidence of naturally occurring wave-wave interactions in the polar ionosphere, using data obtained with the EISCAT Svalbard Radar (ESR). The simultaneous and co-located observations of enhancements in the ion and plasma lines can only be explained in terms of wave-wave interactions taking place within the scattering volume. These measurements strengthen previous indications that Langmuir wave decay/turbulence triggered by a low energy electron beam associated with the aurora may be the source of Naturally Enhanced Ion Acoustic Lines (NEIAL) observed with incoherent scatter radars over the last decade. Our main objectives and results in this paper are: (1) To show that our measurements represent experimental proof that wave-wave interactions take place in the ionosphere naturally. (2) To investigate the possibility that this wave-wave interaction is causally related to the NEIAL.
DE: 7868 Wave/wave interactions
DE: 6929 Ionospheric physics (2409)
DE: 2407 Auroral ionosphere (2704)
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2471 Plasma waves and instabilities
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting