Linking remote imagery of two coronal mass ejections to their in situ signatures at 1 AU

Details Linking remote imagery of two coronal mass ejections to their in situ signatures at 1 AU Linking remote imagery of two coronal mass ejections to their in situ signatures at 1 AU

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41a1629m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH41A-1629

Astronomy and Astrophysics

Astrophysics

[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7924] Space Weather / Forecasting

Scientific paper

We report on how the internal structure of two coronal mass ejections at 1 AU might be deduced from white-light images of the heliosphere taken from a remote observation point. On June 6-7 2008 the STEREO-B spacecraft encountered typical signatures of a magnetic flux rope inside an interplanetary coronal mass ejection (ICME). Its axis was inclined at 45° to the solar equatorial plane, crossing it at approximately 30° east of Earth. This direction matches well with various CME direction-finding techniques to within 15°, and a possible westward deflection of 10° took place between the Sun and 1 AU. Further, we use remote images from STEREO-A to show that (1) the CME is unambiguously connected to the ICME which swept over STEREO B and can be tracked all the way to the 1 AU event, (2) the particular arc-like morphology of the CME pointing to an inclined axis, and (3) the three-part structure of the CME may be plausibly related to the in situ data with clear density variations. The CME event on Feb 13 2009 followed by a magnetic cloud on Feb 18 2009 is discussed from the same viewpoint, though the in-situ signatures are more complex than for the simple event discussed above.

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