Pc1 pulsations observed by AMPTE/CCE in the Earth's outer magnetosphere
書誌事項
- 公開日
- 1990-10
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/gl017i011p01853
- 公開者
- American Geophysical Union (AGU)
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説明
<jats:p>Electromagnetic ion cyclotron waves in the Pc1–2 frequency range (0.1–5 Hz) have been observed in Earth's equatorial magnetosphere over the range <jats:italic>L</jats:italic>=3 to 9 by the AMPTE/CCE magnetic fields experiment. We report detailed analysis of data from two orbits together with preliminary occurrence statistics from 31 days. One example occurred during disturbed geomagnetic conditions (maximum AE>1000 nT) and exhibited intense Pc1 from <jats:italic>L</jats:italic>=5 to the magnetopause (<jats:italic>L</jats:italic>≈7.5). The second example occurred during moderate to quiet conditions (average AE≈300 nT) and displayed Pc1 in two distinct <jats:italic>L</jats:italic> ranges: low (<jats:italic>L</jats:italic>≈4) and high (<jats:italic>L</jats:italic>>7,5). Statistical results show that Pc1 are ≈4 times more common for <jats:italic>L</jats:italic>>7 than for <jats:italic>L</jats:italic><6 and occur primarily in the afternoon. The discovery of a statistically dominant outer magnetospheric source region implies that ring current interaction with the plasmasphere is not the primary source of Pcl excitation but suggests that plasma sheet ions may be a significant energy source for Pc1. This result is consistent with the strong dependence of the linear convective growth rate on magnetic field strength.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 17 (11), 1853-1856, 1990-10
American Geophysical Union (AGU)
