NDLI: Coupling of Pi2 wave energy in the inner magnetosphere as inferred from low-latitude ground observations

Content Provider	Springer Nature Link
Author	Han, DeSheng Yang, HuiGen Chen, ZhuoTian Nielsen, C. P.
Copyright Year	2008
Abstract	Taking advantage of high time-resolution (1 s) geomagnetic field measurements obtained at low-latitude stations, we investigated frequency differences of Pi2 pulsations between the dayside and the nightside. Firstly, we examined two Pi2 cases globally observed by multiple ground stations and found that the dominant frequency peaks at the dayside showed latitudinal dependence, i.e., the higher (lower) frequency peak was predominant at lower (higher) latitude. We also noticed that the dominant Pi2 frequency on the nightside was apparently higher than that on the dayside. We argue that the multiple frequency peaks observed on the ground are harmonics of a plasmaspheric cavity resonance mode (CRM) and that the latitudinal dependence of the dominant frequency peaks may result from the energy coupling between the CRM and field line resonance (FLR) occurred in the near Earth space. We also argue that the frequency difference between the dayside and the nightside could be caused by the reason that a higher harmonic was observed in the nightside plasmasphere but was not effectively observed in the dayside. In addition, we statistically examined 829 Pi2 events that were simultaneously recorded at Kakioka (KAK, Maglat=27.2°) and Jicamarca (JIC, Maglat=0.0°), the two stations separated by ∼10 h in local time (LT) and one of them (JIC) is located at the dip equator. We found that the Pi2 frequency observed at KAK on the nightside was higher than that observed at JIC on the dayside on average. After investigating the occurrence histogram of the frequency difference (Δf=f $_{JIC}$?f $_{KAK}$) for the events simultaneously observed at KAK and JIC, we found that close to half of the events had the identical frequency (\|Δf\|<1.0 mHz). The statistical results are consistent with the facts reflected by case studies.
Starting Page	1745
Ending Page	1758
Page Count	14
File Format	PDF
ISSN	10069321
Journal	Science in China Series E: Technological Sciences
Volume Number	51
Issue Number	10
e-ISSN	1862281X
Language	English
Publisher	SP Science in China Press
Publisher Date	2008-09-14
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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