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: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2011-09-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/1663/2011/angeo-29-1663-2011.pdf |
| _version_ | 1818538848643186688 |
|---|---|
| author | H. Kawano H. Kawano S. Ohtani T. Uozumi T. Tokunaga T. Tokunaga A. Yoshikawa A. Yoshikawa K. Yumoto K. Yumoto E. A. Lucek M. André the CPMN group |
| author_facet | H. Kawano H. Kawano S. Ohtani T. Uozumi T. Tokunaga T. Tokunaga A. Yoshikawa A. Yoshikawa K. Yumoto K. Yumoto E. A. Lucek M. André the CPMN group |
| author_sort | H. Kawano |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T21:34:17Z |
| format | Article |
| id | doaj.art-ad54402186ad4e04a272882fac81ac76 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-11T21:34:17Z |
| publishDate | 2011-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-ad54402186ad4e04a272882fac81ac762022-12-22T00:50:03ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762011-09-01291663167210.5194/angeo-29-1663-2011Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapauseH. Kawano0H. Kawano1S. Ohtani2T. Uozumi3T. Tokunaga4T. Tokunaga5A. Yoshikawa6A. Yoshikawa7K. Yumoto8K. Yumoto9E. A. Lucek10M. André11the CPMN group12Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, JapanSpace Environment Research Center, Kyushu University, Fukuoka, JapanJohns Hopkins University, Applied Physics Laboratory, Laurel, USASpace Environment Research Center, Kyushu University, Fukuoka, JapanDepartment of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japannow at: Meiji Institute for Advanced Study of Mathematical Sciences, Kawasaki, JapanDepartment of Earth and Planetary Sciences, Kyushu University, Fukuoka, JapanSpace Environment Research Center, Kyushu University, Fukuoka, JapanDepartment of Earth and Planetary Sciences, Kyushu University, Fukuoka, JapanSpace Environment Research Center, Kyushu University, Fukuoka, JapanSpace and Atmospheric Physics Group, Blackett Laboratory, Imperial College, London, UKSwedish Institute of Space Physics, Uppsala, Sweden<a href="http://denji102.geo.kyushu-u.ac.jp/denji/obs/cpmn/cpmn_obs_e.html" target="_blank">http://denji102.geo.kyushu-u.ac.jp/denji/obs/cpmn/cpmn_obs_e.html</a>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.https://www.ann-geophys.net/29/1663/2011/angeo-29-1663-2011.pdf |
| spellingShingle | H. Kawano H. Kawano S. Ohtani T. Uozumi T. Tokunaga T. Tokunaga A. Yoshikawa A. Yoshikawa K. Yumoto K. Yumoto E. A. Lucek M. André the CPMN group Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause Annales Geophysicae |
| title | Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause |
| title_full | Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause |
| title_fullStr | Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause |
| title_full_unstemmed | Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause |
| title_short | Pi 2 waves simultaneously observed by Cluster and CPMN ground-based magnetometers near the plasmapause |
| title_sort | pi 2 waves simultaneously observed by cluster and cpmn ground based magnetometers near the plasmapause |
| url | https://www.ann-geophys.net/29/1663/2011/angeo-29-1663-2011.pdf |
| work_keys_str_mv | AT hkawano pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT hkawano pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT sohtani pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT tuozumi pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT ttokunaga pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT ttokunaga pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT ayoshikawa pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT ayoshikawa pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT kyumoto pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT kyumoto pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT ealucek pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT mandre pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause AT thecpmngroup pi2wavessimultaneouslyobservedbyclusterandcpmngroundbasedmagnetometersneartheplasmapause |