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| Titel |
3-D reconstructions of the early-November 2004 CDAW geomagnetic storms: analysis of Ooty IPS speed and density data |
| VerfasserIn |
M. M. Bisi, B. V. Jackson, J. M. Clover, P. K. Manoharan, M. Tokumaru, P. P. Hick, A. Buffington |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 12 ; Nr. 27, no. 12 (2009-12-10), S.4479-4489 |
| Datensatznummer |
250016725
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4479-2009.pdf |
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| Zusammenfassung |
| Interplanetary scintillation (IPS) remote-sensing observations provide a view
of the solar wind covering a wide range of heliographic latitudes and
heliocentric distances from the Sun between ~0.1 AU and 3.0 AU. Such
observations are used to study the development of solar coronal transients
and the solar wind while propagating out through interplanetary space. They
can also be used to measure the inner-heliospheric response to the passage of
coronal mass ejections (CMEs) and co-rotating heliospheric structures. IPS
observations can, in general, provide a speed estimate of the heliospheric
material crossing the observing line of site; some radio antennas/arrays can
also provide a radio scintillation level. We use a three-dimensional (3-D)
reconstruction technique which obtains perspective views from outward-flowing
solar wind and co-rotating structure as observed from Earth by iteratively
fitting a kinematic solar wind model to these data. Using this 3-D modelling
technique, we are able to reconstruct the velocity and density of CMEs as
they travel through interplanetary space. For the time-dependent model used
here with IPS data taken from the Ootacamund (Ooty) Radio Telescope (ORT) in
India, the digital resolution of the tomography is 10° by
10° in both latitude and longitude with a half-day time cadence.
Typically however, the resolutions range from 10° to
20° in latitude and longitude, with a half- to one-day time cadence
for IPS data dependant upon
how much data are used as input to the tomography.
We compare reconstructed structures during early-November 2004 with in-situ
measurements from the Wind spacecraft orbiting the Sun-Earth L1-Point to
validate the 3-D tomographic reconstruction results and comment on how these
improve upon prior reconstructions. |
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