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Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/8113

Title: First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars
Authors: Robinson, T.R.
Yeoman, Tim K.
Dhillon, R.S.
Lester, M.
Thomas, E.C.
Thornhill, J.D.
Wright, D.M.
van Eyken, A.P.
McCrea, I.W.
Issue Date: 7-Mar-2006
Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Citation: Annales Geophysicae, 2006, 24 (1), pp. 291-309.
Abstract: Results are presented from the first two active experimental campaigns undertaken by the new SPEAR (Space Plasma Exploration by Active Radar) high-power system that has recently become operational on Spitzbergen, in the Svalbard archipelago. SPEAR's high-power beam was used to excite artificial enhancements in the backscatter detected by the ESR (EISCAT Svalbard Radar) parallel to the geomagnetic field, as well as coherent backscatter detected by both of the CUTLASS (Co-operative UK Twin Located Auroral Sounding System) coherent radars, in directions orthogonal to the geomagnetic field. The ESR detected both enhanced ion-lines as well as enhanced plasma-lines, that were sustained for the whole period when SPEAR was transmitting ordinary mode radio waves, at frequencies below the maximum F-region plasma frequency. On a number of occasions, coherent backscatter was also observed in one or in both of the CUTLASS radars, in beams that intersected the heated volume. Although the levels of enhanced backscatter varied considerably in time, it appeared that ion-line, plasma-line and coherent backscatter were all excited simultaneously, in contrast to what has typically been reported at Tromsø, during EISCAT heater operations. A description of the technical and operational aspects of the new SPEAR system is also included.
ISSN: 0992-7689
Links: http://dx.doi.org/10.5194/angeo-24-291-2006
http://hdl.handle.net/2381/8113
Type: Article
Description: This paper was published as Annales Geophysicae, 2006, 24 (1), pp. 291-309. It is also available from http://www.ann-geophys.net/24/291/2006/angeo-24-291-2006.html. Doi: 10.5194/angeo-24-291-2006
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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