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| HAL: hal-00316613, version 1 |
| Detailed view |  Export this paper |
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| Annales Geophysicae 18, 4 (2000) 406-410 |
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| Magnetospheric lion roars |
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| W. Baumjohann 1E. Georgescu 1, 2 |
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| (2000) |
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| The Equator-S magnetometer is very sensitive and has a sampling rate normally of 128 Hz. The high sampling rate for the first time allows detection of ELF waves between the ion cyclotron and the lower hybrid frequencies in the equatorial dawnside magnetosphere. The characteristics of these waves are virtually identical to the lion roars typically seen at the bottom of the magnetic troughs of magnetosheath mirror waves. The magnetospheric lion roars are near-monochromatic packets of electron whistler waves lasting for a few wave cycles only, typically 0.2 s. They are right-hand circularly polarized waves with typical amplitudes of 0.5 nT at around one tenth of the electron gyrofrequency. The cone angle between wave vector and ambient field is nearly always smaller than 1°. |
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| 1: | Max-Planck-Institut für extraterrestrische Physik |
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Max-Planck-Institut für extraterrestrische Physik |
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| 2: | Institut for Space Sciences |
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Institut for Space Sciences |
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| 3: | Institut für Geophysik und Meteorologie |
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Institut für Geophysik und Meteorologie |
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| Subject | : | Sciences of the Universe/Ocean, Atmosphere Sciences of the Universe/Earth Sciences |
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| Attached file list to this document: | |||||
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| hal-00316613, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00316613 | |
| oai:hal.archives-ouvertes.fr:hal-00316613 | |
| From: Publication EGU | |
| Submitted on: Saturday, 1 January 2000 08:00:00 | |
| Updated on: Wednesday, 3 September 2008 11:11:00 | |
