First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars
International audience 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 us...
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ftinsu:oai:HAL:hal-00317935v1 2023-11-12T04:16:35+01:00 First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars Robinson, T. R. Yeoman, T. K. Dhillon, R. S. Lester, M. Thomas, E. C. Thornhill, J. D. Wright, D. M. van Eyken, A. P. Mccrea, I. W. Department of Physics and Astronomy Leicester University of Leicester EISCAT Scientific Association Space Science and Technology Department Didcot (RAL Space) STFC Rutherford Appleton Laboratory (RAL) Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC) 2006-03-07 https://hal.science/hal-00317935 https://hal.science/hal-00317935/document https://hal.science/hal-00317935/file/angeo-24-291-2006.pdf en eng HAL CCSD European Geosciences Union hal-00317935 https://hal.science/hal-00317935 https://hal.science/hal-00317935/document https://hal.science/hal-00317935/file/angeo-24-291-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317935 Annales Geophysicae, 2006, 24 (1), pp.291-309 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2006 ftinsu 2023-10-25T16:25:08Z International audience 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. Article in Journal/Newspaper EISCAT Spitzbergen Svalbard Tromsø Institut national des sciences de l'Univers: HAL-INSU Svalbard Svalbard Archipelago Tromsø |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Robinson, T. R. Yeoman, T. K. Dhillon, R. S. Lester, M. Thomas, E. C. Thornhill, J. D. Wright, D. M. van Eyken, A. P. Mccrea, I. W. First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience 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. |
author2 |
Department of Physics and Astronomy Leicester University of Leicester EISCAT Scientific Association Space Science and Technology Department Didcot (RAL Space) STFC Rutherford Appleton Laboratory (RAL) Science and Technology Facilities Council (STFC)-Science and Technology Facilities Council (STFC) |
format |
Article in Journal/Newspaper |
author |
Robinson, T. R. Yeoman, T. K. Dhillon, R. S. Lester, M. Thomas, E. C. Thornhill, J. D. Wright, D. M. van Eyken, A. P. Mccrea, I. W. |
author_facet |
Robinson, T. R. Yeoman, T. K. Dhillon, R. S. Lester, M. Thomas, E. C. Thornhill, J. D. Wright, D. M. van Eyken, A. P. Mccrea, I. W. |
author_sort |
Robinson, T. R. |
title |
First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
title_short |
First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
title_full |
First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
title_fullStr |
First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
title_full_unstemmed |
First observations of SPEAR-induced artificial backscatter from CUTLASS and the EISCAT Svalbard radars |
title_sort |
first observations of spear-induced artificial backscatter from cutlass and the eiscat svalbard radars |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00317935 https://hal.science/hal-00317935/document https://hal.science/hal-00317935/file/angeo-24-291-2006.pdf |
geographic |
Svalbard Svalbard Archipelago Tromsø |
geographic_facet |
Svalbard Svalbard Archipelago Tromsø |
genre |
EISCAT Spitzbergen Svalbard Tromsø |
genre_facet |
EISCAT Spitzbergen Svalbard Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00317935 Annales Geophysicae, 2006, 24 (1), pp.291-309 |
op_relation |
hal-00317935 https://hal.science/hal-00317935 https://hal.science/hal-00317935/document https://hal.science/hal-00317935/file/angeo-24-291-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333636442324992 |