Location of Repository

First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars

By T. R. Robinson, Tim K. Yeoman, R. S. Dhillon, M. Lester, E. C. Thomas, J. D. Thornhill, D. M. Wright, A. P. van Eyken and I. W. McCrea

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

Publisher: Copernicus Publications on behalf of the European Geosciences Union (EGU)
Year: 2006
DOI identifier: 10.5194/angeo-24-291-2006
OAI identifier: oai:lra.le.ac.uk:2381/8113
Journal:

Suggested articles

Preview

Citations

  1. (1994). Altitude characteristics of plasma turbulence excited with the Tromsø superheater, doi
  2. (1974). Arecibo heating experiments, doi
  3. (2003). Correction to Rietveld et al.
  4. (1995). DARN/SuperDARN: A global view of the dynamics of highlatitude convection, doi
  5. (2002). Effect of multiple scatter on the propagation and absorption of electromagnetic waves in a field-aligned-striated magnetoplasma: Implications for ionospheric modification experiments, doi
  6. (2000). FAST observations of ULF waves injected into the magnetosphere by means of modulated RF heating of the auroral electrojet, doi
  7. (1999). First direct observations of the reduced striations at pump frequencies close to the electron gyroharmonics, doi
  8. (1997). High spatial and temporal resolution observations of an impulsedriven field line resonance in backscatter radar artificially generated with the Tromsø heater, doi
  9. (1993). Introduction to ionospheric heating experiments at Tromsø-II. Scientific problems, doi
  10. (2003). Ionospheric electron heating, optical emissions and striations induced by powerful HF radio waves at high latitudes: aspect angle dependence, doi
  11. (1979). Ionospheric modification and parametric instabilities, doi
  12. (2000). Measurements of HF-enhanced plasma and ion lines at EISCAT with high-altitude resolution, doi
  13. (1990). New phenomena observed by EISCAT during an RF ionospheric modification experiment, doi
  14. (1997). O and X mode heating effects observed simultaneously with the CUTLASS and EISCAT radars and low power HF diagnostics at Tromsø,
  15. (2005). Observations of timedependence and aspect sensitivity of regions of enhanced UHF backscatter associated with RF heating, doi
  16. (1972). Purely-growing parametric instability in an inhomogeneous plasma, doi
  17. (2002). Radar ACFs and turbulence characteristics from artificially generated fieldaligned irregularities, doi
  18. (1974). Radio frequency scattering from a heated ionospheric volume, 1, VHF/UHF fieldaligned and plasma-line backscatter measurements, doi
  19. (1997). Spatial observations by the CUTLASS coherent scatter radar of ionospheric modification by high power radio waves, doi
  20. (2004). Stereo CUTLASS: A new capability for the SuperDARN radars, doi
  21. (1989). The heating of the high latitude ionosphere by high power radio waves, doi
  22. (1979). The spectral measurement of plasma lines, doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.