Morning sector drift-bounce resonance driven ULF waves observed in artificially-induced HF radar backscatter
HF radar backscatter, which has been artificially-induced by a high power RF facility such as the EISCAT heater at Tromsø, has provided coherent radar ionospheric electric field data of unprecedented temporal resolution and accuracy. Here such data are used to investigate ULF wave processes...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2002-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/20/1487/2002/angeo-20-1487-2002.pdf |
| Summary: | HF radar backscatter,
which has been artificially-induced by a high power RF facility such as the
EISCAT heater at Tromsø, has provided coherent radar ionospheric electric
field data of unprecedented temporal resolution and accuracy. Here such data
are used to investigate ULF wave processes observed by both the CUTLASS HF
radars and the EISCAT UHF radar. Data from the SP-UK-OUCH experiment have
revealed small-scale (high azimuthal wave number, <i>m</i> <approx> -45)
waves, predominantly in the morning sector, thought to be brought about by the
drift-bounce resonance processes. Conjugate observations from the Polar
CAM-MICE instrument indicate the presence of a non-Maxwellian ion distribution
function. Further statistical analysis has been undertaken, using the Polar
TIMAS instrument, to reveal the prevalence and magnitude of the non-Maxwellian
energetic particle populations thought to be responsible for generating these
wave types.<br><br><b>Key words. </b>Ionosphere (active
experiments; wave-particle interactions) Magnetospheric physics (MHD waves and
instabilities) |
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| ISSN: | 0992-7689 1432-0576 |