Reliability of CHAMP Anomaly Continuations
CHAMP is recording state-of-the-art magnetic and gravity field observations at altitudes ranging over roughly 300 - 550 km. However, anomaly continuation is severely limited by the non-uniqueness of the process and satellite anomaly errors. Indeed, our numerical anomaly simulations from satellite to...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20040034236 2023-05-15T13:30:43+02:00 Reliability of CHAMP Anomaly Continuations vonFrese, Ralph R. B. Kim, Hyung Rae Taylor, Patrick T. Asgharzadeh, Mohammad F. Unclassified, Unlimited, Publicly available [2003] application/pdf http://hdl.handle.net/2060/20040034236 unknown Document ID: 20040034236 http://hdl.handle.net/2060/20040034236 No Copyright CASI Geophysics 2nd CHAMP Meeting; 1-5 Sep. 2003; Potsdam; Germany 2003 ftnasantrs 2019-07-21T02:20:26Z CHAMP is recording state-of-the-art magnetic and gravity field observations at altitudes ranging over roughly 300 - 550 km. However, anomaly continuation is severely limited by the non-uniqueness of the process and satellite anomaly errors. Indeed, our numerical anomaly simulations from satellite to airborne altitudes show that effective downward continuations of the CHAMP data are restricted to within approximately 50 km of the observation altitudes while upward continuations can be effective over a somewhat larger altitude range. The great unreliability of downward continuation requires that the satellite geopotential observations must be analyzed at satellite altitudes if the anomaly details are to be exploited most fully. Given current anomaly error levels, joint inversion of satellite and near- surface anomalies is the best approach for implementing satellite geopotential observations for subsurface studies. We demonstrate the power of this approach using a crustal model constrained by joint inversions of near-surface and satellite magnetic and gravity observations for Maude Rise, Antarctica, in the southwestern Indian Ocean. Our modeling suggests that the dominant satellite altitude magnetic anomalies are produced by crustal thickness variations and remanent magnetization of the normal polarity Cretaceous Quiet Zone. Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) Indian Maude ENVELOPE(168.417,168.417,-83.150,-83.150) |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Geophysics |
spellingShingle |
Geophysics vonFrese, Ralph R. B. Kim, Hyung Rae Taylor, Patrick T. Asgharzadeh, Mohammad F. Reliability of CHAMP Anomaly Continuations |
topic_facet |
Geophysics |
description |
CHAMP is recording state-of-the-art magnetic and gravity field observations at altitudes ranging over roughly 300 - 550 km. However, anomaly continuation is severely limited by the non-uniqueness of the process and satellite anomaly errors. Indeed, our numerical anomaly simulations from satellite to airborne altitudes show that effective downward continuations of the CHAMP data are restricted to within approximately 50 km of the observation altitudes while upward continuations can be effective over a somewhat larger altitude range. The great unreliability of downward continuation requires that the satellite geopotential observations must be analyzed at satellite altitudes if the anomaly details are to be exploited most fully. Given current anomaly error levels, joint inversion of satellite and near- surface anomalies is the best approach for implementing satellite geopotential observations for subsurface studies. We demonstrate the power of this approach using a crustal model constrained by joint inversions of near-surface and satellite magnetic and gravity observations for Maude Rise, Antarctica, in the southwestern Indian Ocean. Our modeling suggests that the dominant satellite altitude magnetic anomalies are produced by crustal thickness variations and remanent magnetization of the normal polarity Cretaceous Quiet Zone. |
format |
Other/Unknown Material |
author |
vonFrese, Ralph R. B. Kim, Hyung Rae Taylor, Patrick T. Asgharzadeh, Mohammad F. |
author_facet |
vonFrese, Ralph R. B. Kim, Hyung Rae Taylor, Patrick T. Asgharzadeh, Mohammad F. |
author_sort |
vonFrese, Ralph R. B. |
title |
Reliability of CHAMP Anomaly Continuations |
title_short |
Reliability of CHAMP Anomaly Continuations |
title_full |
Reliability of CHAMP Anomaly Continuations |
title_fullStr |
Reliability of CHAMP Anomaly Continuations |
title_full_unstemmed |
Reliability of CHAMP Anomaly Continuations |
title_sort |
reliability of champ anomaly continuations |
publishDate |
2003 |
url |
http://hdl.handle.net/2060/20040034236 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(168.417,168.417,-83.150,-83.150) |
geographic |
Indian Maude |
geographic_facet |
Indian Maude |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
CASI |
op_relation |
Document ID: 20040034236 http://hdl.handle.net/2060/20040034236 |
op_rights |
No Copyright |
_version_ |
1766011623763345408 |