@inproceedings{oai:jaxa.repo.nii.ac.jp:00006408, author = {Eriksson, A. I. and Wahlund, J. E.}, book = {宇宙航空研究開発機構特別資料, JAXA Special Publication: 9th Spacecraft Charging Technology Conference}, month = {Aug}, note = {We present event studies and results of a statistical investigation on charging events seen by the Freja satellite in the auroral zone at 1,500-1,700 km altitude. Charging up to kilovolts is sometimes observed, though lower values are more normal. Comparing to DMSP at 840 km, Freja experiences fewer charging events, but some of them are found in sunlit conditions, which has not been seen on DMSP. No charging event occurred for a density above 2,000 cu cm, though correlation between density and charging otherwise was weak. All charging events show enhanced electron fluxes around or above 10 keV, including enhanced tails up to 100 keV, while electrons around 1 keV instead counteracts charging, as is expected from high secondary yields in this energy range. Simulations using POLAR reproduced moderate charging events, but not the events with kilovolt charging., 資料番号: AA0049206093, レポート番号: JAXA-SP-05-001E}, pages = {804--812}, publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)}, title = {Charging of a conductive spacecraft in the auroral zone}, volume = {JAXA-SP-05-001E}, year = {2005} }