Characteristics of very large aspect angle E-region coherent echoes at 933 MHz
International audience The EISCAT UHF radar system was used to study the characteristics of E-region coherent backscatter at very large magnetic aspect angles (5?11°). Data taken using 60 ?s pulses during elevation scans through horizontally uniform backscatter permitted the use of inversion techniq...
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ftinsu:oai:HAL:hal-00316177v1 2023-11-12T04:16:37+01:00 Characteristics of very large aspect angle E-region coherent echoes at 933 MHz Jackel, B. J. Moorcroft, D. R. Schlegel, K. Department of Physics University of Western Ontario (UWO) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft 1997 https://hal.science/hal-00316177 https://hal.science/hal-00316177/document https://hal.science/hal-00316177/file/angeo-15-54-1997.pdf en eng HAL CCSD European Geosciences Union hal-00316177 https://hal.science/hal-00316177 https://hal.science/hal-00316177/document https://hal.science/hal-00316177/file/angeo-15-54-1997.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316177 Annales Geophysicae, 1997, 15 (1), pp.54-62 [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 1997 ftinsu 2023-10-25T16:25:42Z International audience The EISCAT UHF radar system was used to study the characteristics of E-region coherent backscatter at very large magnetic aspect angles (5?11°). Data taken using 60 ?s pulses during elevation scans through horizontally uniform backscatter permitted the use of inversion techniques to determine height profiles of the scattering layer. The layer was always singly peaked, with a mean height of 104 km, and mean thickness (full width at half maximum) of 10 km, both independent of aspect angle. Aspect sensitivities were also estimated, with the Sodankylä-Tromsø link observing 5 dB/degree at aspect angles near 5°, decreasing to 3 dB/degree at 10° aspect angle. Observed coherent phase velocities from all three stations were found to be roughly consistent with LOS measurements of a common E-region phase velocity vector. The E-region phase velocity had the same orientation as the F-region ion drift velocity, but was approximately 50% smaller in magnitude. Spectra were narrow with skewness of about +1 (for negative velocities), increasing slightly with aspect angle. Article in Journal/Newspaper EISCAT Sodankylä Tromsø Institut national des sciences de l'Univers: HAL-INSU Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) 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 Jackel, B. J. Moorcroft, D. R. Schlegel, K. Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The EISCAT UHF radar system was used to study the characteristics of E-region coherent backscatter at very large magnetic aspect angles (5?11°). Data taken using 60 ?s pulses during elevation scans through horizontally uniform backscatter permitted the use of inversion techniques to determine height profiles of the scattering layer. The layer was always singly peaked, with a mean height of 104 km, and mean thickness (full width at half maximum) of 10 km, both independent of aspect angle. Aspect sensitivities were also estimated, with the Sodankylä-Tromsø link observing 5 dB/degree at aspect angles near 5°, decreasing to 3 dB/degree at 10° aspect angle. Observed coherent phase velocities from all three stations were found to be roughly consistent with LOS measurements of a common E-region phase velocity vector. The E-region phase velocity had the same orientation as the F-region ion drift velocity, but was approximately 50% smaller in magnitude. Spectra were narrow with skewness of about +1 (for negative velocities), increasing slightly with aspect angle. |
author2 |
Department of Physics University of Western Ontario (UWO) Max-Planck-Institut für Aeronomie (MPI Aeronomie) Max-Planck-Gesellschaft |
format |
Article in Journal/Newspaper |
author |
Jackel, B. J. Moorcroft, D. R. Schlegel, K. |
author_facet |
Jackel, B. J. Moorcroft, D. R. Schlegel, K. |
author_sort |
Jackel, B. J. |
title |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
title_short |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
title_full |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
title_fullStr |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
title_full_unstemmed |
Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
title_sort |
characteristics of very large aspect angle e-region coherent echoes at 933 mhz |
publisher |
HAL CCSD |
publishDate |
1997 |
url |
https://hal.science/hal-00316177 https://hal.science/hal-00316177/document https://hal.science/hal-00316177/file/angeo-15-54-1997.pdf |
long_lat |
ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Sodankylä Tromsø |
geographic_facet |
Sodankylä Tromsø |
genre |
EISCAT Sodankylä Tromsø |
genre_facet |
EISCAT Sodankylä Tromsø |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316177 Annales Geophysicae, 1997, 15 (1), pp.54-62 |
op_relation |
hal-00316177 https://hal.science/hal-00316177 https://hal.science/hal-00316177/document https://hal.science/hal-00316177/file/angeo-15-54-1997.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782333694627807232 |