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| Titel |
On the radial width of CMEs between 0.1 and 0.4 AU |
| VerfasserIn |
N. P. Savani, R. J. Forsyth, A. P. Rouillard, M. J. Owens, J. A. Davies |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250026773
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| Zusammenfassung |
| The launch of the two STEREO spacecraft in 2006 has heralded a new era of opportunities to
make remote observations of interplanetary coronal mass ejections (ICMEs). An example
CME on the 16th February 2008 with an approximately circular cross section was tracked
through successive images obtained by the Heliospheric Imager (HI) instrument onboard the
STEREO-A spacecraft. The cylindrical nature of force-free constant alpha flux ropes is
used to determine the radial size of the CME. The radial velocity and longitude of
propagation are determined. With these parameters known, the radial size is calculated
from the images taking projection effects into account. A power law is obtained for
the resulting radial width behaviour with heliocentric distance as the CME travels
between 0.1 and 0.4 AU. We compare our results to those obtained in published
studies based on in-situ spacecraft observations of ICMEs between 0.3 and 1.0 AU. |
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