HR: 0800h
AN: SA51A-08    [Abstracts]
TI: The Spectral Characteristics of Coherent HF Radar Observations of Heater-induced Irregularities and Their Geophysical Influences.
AU: * Wright, D M
EM: Darren.Wright@ion.le.ac.uk
AF: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
AU: Yeoman, T K
EM: yxo@ion.le.ac.uk
AF: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
AU: Dhillon, R S
EM: rsd6@ion.le.ac.uk
AF: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
AU: Baddeley, L J
EM: ljb14@ion.le.ac.uk
AF: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
AU: Robinson, T R
EM: txr@ion.le.ac.uk
AF: Radio and Space Plasma Physics Group, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom
AU: Rietveld, M
EM: mike.rietveld@eiscat.uit.no
AF: EISCAT Scientific Association, Ramfjordmoen, N-9027 Ramfjordbotn, Norway
AU: Yukimatu, A S
EM: sessai@uap.nipr.ac.jp
AF: National Institute of Polar Research, 9-10, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
AB: The CUTLASS HF coherent radars provide important measurements of the perturbed ionosphere during heating experiments utilising the SPEAR high power radar, located in the Svalbard archipelago, and the EISCAT heating facility at Tromso, northern Norway. The heaters induce field-aligned irregularities (FAIs) which provide intense targets in the CUTLASS field of view. Once the FAIs are created, CUTLASS can diagnose dynamic phenomena occurring in the coupled magnetosphere-ionosphere system. As a result of their long decorrelation time, the CUTLASS backscatter from the artificial FAIs exhibit low spectral widths and, as a result, provide very accurate measurements of flow velocities. It has been observed that on occasions when ULF waves influence the motion of the heater-induced irregularities, the spectral characteristics associated with the scatter are modified. In particular, enhancements in the spectral width are often observed when particle-driven waves are detected. A number of events will be presented where this is the case and the possible mechanisms which may lead to these spectral enhancements will be discussed.
UR: http:www.ion.le.ac.uk/spear
DE: 2403 Active experiments
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly