第3回極域科学シンポジウム　横断セッション「中層大気・熱圏」 11月26日（月） 国立極地研究所 ２階大会議

Daae M.

Espy P.J.

Hibbins R.

Newnham D.

Sørås F.

National Institute of Polar Research Repository

 Atmospheric effects of radiation belt precipitation over Antarctica  P.J. Espy1, M. Daae1, R. Hibbins1, D. Newnham2, F. Sørås3 1) Norwegian University of Science and Technology, Trondheim, Norway 2) British Antarctic Survey, Cambridge, UK 3) University of Bergen (UiB), Bergen, Norway  The effects of a moderate geomagnetic storm in July 2009 have been investigated using a microwave radiometer stationed at Troll, Antarctica (72S, 2.5E, L=4.76). The radiometer operated at 250/230 GHz to gives high temporal and vertical resolution of the NO, O3 and CO column. This data was combined with satellite and ground-based observations over Antarctic stations at Rothera (68S, 68W) and Sanae (72S, 3W).  We compare simultaneous measurements of ozone and nitric oxide from a microwave radiometer at Troll, with changes in radar derived mesospheric winds at Rothera and Sanae and hydroxyl nightglow derived temperature and radiance levels observed at Rothera. During the moderate July 2009 storm, we use POES satellite data to identify and analyze the particles that precipitated over Antarctica during the storm. We observe an NO increase spatially and temporally overlapping with an O3 depletion of 30% between 60 and 80 km altitude. This O3 depletion lasted for 9 days, and descended to 55 km altitude at a vertical velocity of 1-3 m/s as confirmed by CO descent rates. Coincident with these composition changes we observe a strong increase in mesospheric temperature of 15K. We examine the changes in the atmospheric temperature, wind and hydroxyl radiance in terms of the energy input of the precipitating particles and the observed compositional changes in order to infer the impact of this precipitation on the high southern latitude dynamics. 

Atmospheric effects of radiation belt precipitation over Antarctica

https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=12845&item_no=1&attribute_id=16&file_no=1

Atmospheric effects of radiation belt precipitation over Antarctica

Abstract

Similar works

Full text

Available Versions

National Institute of Polar Research Repository