The Spectral Characteristics of Coherent HF Radar Observations of Heater-induced Irregularities and Their Geophysical Influences.

Details The Spectral Characteristics of Coherent HF Radar Observations of Heater-induced Irregularities and Their Geophysical Influences. The Spectral Characteristics of Coherent HF Radar Observations of Heater-induced Irregularities and Their Geophysical Influences.

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa51a..08w&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SA51A-08

Physics

2403 Active Experiments

Scientific paper

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.

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