A comparison of Pi2 pulsations observed by CHAMP in low Earth orbit and on the ground at low latitudes
Initial results of a comparative study of Pi2 pulsations observed by the CHAMP satellite in low Earth orbit and at a low‐latitude ground station in South Africa are presented. It has for the first time been possible to extract and clearly resolve Pi2 pulsations from low Earth orbit satellite data du...
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Published in | Geophysical research letters Vol. 30; no. 21; pp. 2105 - n/a |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Geophysical Union
01.11.2003
Blackwell Publishing Ltd |
Subjects | |
Online Access | Get full text |
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Summary: | Initial results of a comparative study of Pi2 pulsations observed by the CHAMP satellite in low Earth orbit and at a low‐latitude ground station in South Africa are presented. It has for the first time been possible to extract and clearly resolve Pi2 pulsations from low Earth orbit satellite data due to the unprecedented accuracy and resolution of the CHAMP magnetic field measurements. An important new result is that the correlation between satellite and ground Pi2s is improved by subtraction of a lithospheric magnetic field anomaly model from the satellite data. The analysis indicates that the H‐component of the Pi2 pulsation on the ground is well correlated with the compressional and poloidal components above the ionosphere. Furthermore, in the southern hemisphere the compressional and poloidal components oscillate in phase with H; however, in the northern hemisphere the poloidal component oscillates in anti‐phase with the compressional and H components. |
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Bibliography: | ark:/67375/WNG-GXK9MS3N-H istex:2C80E43C4C33AACABB40406CCE5BB03D67E66C9D ArticleID:2003GL018270 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1029/2003GL018270 |