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| Titel |
On the solar origin of interplanetary disturbances observed in the vicinity of the Earth |
| VerfasserIn |
N. Vilmer, M. Pick, R. Schwenn, P. Ballatore, J. P. Villain |
| 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 ; 21, no. 4 ; Nr. 21, no. 4, S.847-862 |
| Datensatznummer |
250014600
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| Publikation (Nr.) |
 copernicus.org/angeo-21-847-2003.pdf |
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| Zusammenfassung |
The solar origin of 40
interplanetary disturbances observed in the vicinity of the Earth between
January 1997 and June 1998 is investigated in this paper. Analysis starts with
the establishment of a list of Interplanetary Mass Ejections or ICMEs (magnetic
clouds, flux ropes and ejecta) and of Interplanetary Shocks measured at WIND
for the period for which we had previously investigated the coupling of the
interplanetary medium with the terrestrial ionospheric response. A search for
associated coronal mass ejections (CMEs) observed by LASCO/SOHO is then
performed, starting from an estimation of the transit time of the
inter-planetary perturbation from the Sun to the Earth, assumed to be achieved
at a constant speed (i.e. the speed measured at 1 AU). EIT/SOHO and Nançay
Radioheliograph (NRH) observations are also used as proxies in this
identification for the cases when LASCO observations do not allow one to firmly
establish the association. The last part of the analysis concerns the
identification of the solar source of the CMEs, performed using a large set of
solar observations from X-ray to radio wavelengths. In the present study, this
association is based on a careful examination of many data sets (EIT, NRH and H
images and not on the use of catalogs and of Solar Geophysical Data reports).
An association between inter-planetary disturbances and LASCO/CMEs or proxies
on the disk is found for 36 interplanetary events. For 32 events, the solar
source of activity can also be identified. A large proportion of cases is found
to be associated with a flare signature in an active region, not excluding of
course the involvement of a filament. Conclusions are finally drawn on the
propagation of the disturbances in the interplanetary medium, the preferential
association of disturbances detected close to the Earth’s orbit with halos or
wide CMEs and the location on the solar disk of solar sources of the
interplanetary disturbances during that period.
Key words. Interplanetary physics
(interplanetary shocks); solar physics, astrophysics and astronomy (flares and
mass ejections) |
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