Characteristics of very large aspect angle E-region coherent echoes at 933 MHz
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 μs pulses during elevation scans through horizontally uniform backscatter permitted the use of inversion techniques to deter...
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ftcopernicus:oai:publications.copernicus.org:angeo33850 2023-05-15T16:04:42+02:00 Characteristics of very large aspect angle E-region coherent echoes at 933 MHz Jackel, B. J. Moorcroft, D. R. Schlegel, K. 2018-09-27 application/pdf https://doi.org/10.1007/s00585-997-0054-x https://angeo.copernicus.org/articles/15/54/1997/ eng eng doi:10.1007/s00585-997-0054-x https://angeo.copernicus.org/articles/15/54/1997/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.1007/s00585-997-0054-x 2020-07-20T16:28:09Z 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 μs 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. Text EISCAT Sodankylä Tromsø Copernicus Publications: E-Journals Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Tromsø Annales Geophysicae 15 1 54 62 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
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 μs 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. |
format |
Text |
author |
Jackel, B. J. Moorcroft, D. R. Schlegel, K. |
spellingShingle |
Jackel, B. J. Moorcroft, D. R. Schlegel, K. Characteristics of very large aspect angle E-region coherent echoes at 933 MHz |
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 |
publishDate |
2018 |
url |
https://doi.org/10.1007/s00585-997-0054-x https://angeo.copernicus.org/articles/15/54/1997/ |
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 |
eISSN: 1432-0576 |
op_relation |
doi:10.1007/s00585-997-0054-x https://angeo.copernicus.org/articles/15/54/1997/ |
op_doi |
https://doi.org/10.1007/s00585-997-0054-x |
container_title |
Annales Geophysicae |
container_volume |
15 |
container_issue |
1 |
container_start_page |
54 |
op_container_end_page |
62 |
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1766400318607720448 |