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- Title
Energetic Electron Precipitation Occurrence Rates Determined Using the Syowa East SuperDARN Radar.
- Authors
Bland, Emma C.; Partamies, Noora; Heino, Erkka; Yukimatu, Akira Sessai; Miyaoka, Hiroshi
- Abstract
We demonstrate that the Super Dual Auroral Radar Network (SuperDARN) radar at Syowa station, Antarctica, can be used to detect high frequency radio wave attenuation in the D region ionosphere during energetic electron precipitation (EEP) events. EEP‐related attenuation is identified in the radar data as a sudden reduction in the backscatter power and background noise parameters. We focus initially on EEP associated with pulsating aurora and use images from a colocated all‐sky camera as a validation data set for the radar‐based EEP event detection method. Our results show that high‐frequency attenuation that commences during periods of optical pulsating aurora typically continues for 2–4 hr after the camera stops imaging at dawn. We then use the radar data to determine EEP occurrence rates as a function of magnetic local time (MLT) using a database of 555 events detected in 2011. EEP occurrence rates are highest in the early morning sector and lowest at around 15:00–18:00 MLT. The postmidnight and morning sector occurrence rates exhibit significant seasonal variations, reaching approximately 50% in the winter and 15% in the summer, whereas no seasonal variations were observed in other MLT sectors. The mean event lifetime determined from the radar data was 2.25 hr, and 10% of events had lifetimes exceeding 5 hr. Key Points: D region ionization due to energetic electron precipitation can be detected using a high‐frequency radar at Syowa station, AntarcticaEvent detection method is validated using all‐sky camera observations of pulsating auroraeEnergetic electron precipitation occurrence rates peak in the morning sector and in the winter
- Subjects
RADIO wave attenuation; IONOSPHERE; BACKSCATTERING; AURORAS; ELECTRON precipitation
- Publication
Journal of Geophysical Research. Space Physics, 2019, Vol 124, Issue 7, p6253
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2018JA026437