Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause
We have analyzed an event on 14 February 2003 in which Cluster satellites and the CPMN ground magnetometer chain made simultaneous observations of a Pi 2 pulsation along the same meridian. Three of the four Cluster satellites were located outside the plasmasphere, while the other one was located...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2011-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/1663/2011/angeo-29-1663-2011.pdf |
| Summary: | We have analyzed an event on 14 February 2003 in which Cluster satellites
and the CPMN ground magnetometer chain made simultaneous observations of a
Pi 2 pulsation along the same meridian. Three of the four Cluster satellites
were located outside the plasmasphere, while the other one was located
within the plasmasphere. By combining the multipoint observations in space
and the multipoint observations on the ground, we have obtained a detailed
<i>L</i>-profile of the Pi 2 signatures, which has not been done in the past. In
addition, we have used a method called Independent Component Analysis (ICA)
to separate out other superposed waves with similar spectral components. The
result shows that the wave phase of the Pi 2 was the same up to <i>L</i> ∼ 3.9
(corresponding to the plasmasphere), became earlier up to <i>L</i> ∼ 4.1
(corresponding to the plasmapause boundary layer), and showed a delaying
tendency up to <i>L</i> ∼ 5.9 (corresponding to the plasmatrough). This
systematic phase pattern, obtained for the first time by a combination of a
ground magnetometer chain and multisatellites along a magnetic meridian with
the aid of ICA, supports the interpretation that a Pi 2 signal propagated
from a farther source and reached the plasmasphere. |
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| ISSN: | 0992-7689 1432-0576 |