Research Project
Grant-in-Aid for Young Scientists (B)
In order to examine the resonance structure of quarter-wave mode standing Alfven waves, we constructed a new magnetometer array in New Zealand and data from this array were analyzed. Four events are discussed which show extraordinarily low eigenfrequencies, wide resonance widths, and strong damping when the ionosphere above New Zealand was in darkness while the conjugate northern hemisphere ionosphere was sunlit. The wide resonance width and the strong damping of the quarter-wave mode arise from strong energy dissipation in the dark side ionosphere. One event exhibited field line resonance structure continuously through a transition from very low frequency to the normal daytime values. The frequency change began when the dawn terminator passed over New Zealand and finished one hour later. These experimental results were compared with the ULF wave fields obtained from a 2.5-dimensional simulation model.
All 2015 2014 2013 2012 Other
All Journal Article (2 results) (of which Peer Reviewed: 2 results, Acknowledgement Compliant: 1 results) Presentation (18 results) Remarks (1 results)
J. Space Sci. Info. Jpn
Volume: JAXA-RR-14-009 Pages: 75-89
J. Geophys. Res. - Space Physics
Volume: 不明 Issue: 6 Pages: 4194-4212
10.1002/2015ja021096
http://www1.osakac.ac.jp/crux/
