NDLI: Annales Geophysicae D region HF radar echoes associated with energetic particle precipitation and pulsating aurora

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Annales Geophysicae D region HF radar echoes associated with energetic particle precipitation and pulsating aurora

Content Provider	Semantic Scholar
Author	Milan, Stephanie E. Hosokawa, Keisuke Yamagishi, Hisao Honary, Farideh
Copyright Year	2008
Abstract	Milan et al. (2001) identified a class of narrow, slow-moving HF radar backscatter echoes which originate between altitudes of 80 and 100 km, the ionospheric Dand lower E-regions. These echoes appeared to be associated with the occurrence of pulsating aurora, which are known to be created by energetic electrons capable of penetrating to D region altitudes. In this study we show that these echoes are observed in tandem with enhancements in cosmic noise absorption (auroral absorption), additional evidence that energetic (>30 keV) particle precipitation is responsible for generating the irregularities from which a radar can scatter. In addition, we show that the D region backscatter echoes occur predominantly in the post-midnight sector during substorm recovery phase, in common with auroral absorption events and pulsating aurora.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://eprints.lancs.ac.uk/26213/1/art_948.pdf
Language	English
Access Restriction	Open
Subject Keyword	Ablation Altitude Aurora Kinase A Backscatter (email) COSMIC Doppler effect Eighty Electrons Ephrin Type-B Receptor 1, human Hafnium Height Helicon Filter Instability Kiloelectronvolt Magnetic Fields Noise (radio) Organizing (structure) Plasma Active Pulse (signal processing) Radar Region-based memory management Shift JIS Ultrasonography, Doppler, Transcranial electron density magnetometers
Content Type	Text
Resource Type	Article

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