LINKING REMOTE IMAGERY OF A CORONAL MASS EJECTION TO ITS IN SITU SIGNATURES AT 1 AU
In a case study (2008 June 6–7) we report on how the internal structure of a coronal mass ejection (CME) at 1 AU can be anticipated from remote observations of white-light images of the heliosphere. Favorable circumstances are the absence of fast equatorial solar wind streams and a low CME velocity which allow us to relate the imaging and in situ data in a straightforward way. The STEREO-B spacecraft encountered typical signatures of a magnetic flux rope inside an interplanetary CME (ICME) whose axis was inclined at 45° to the solar equatorial plane. Various CME direction-finding techniques yield consistent results to within 15°. Further, remote images from STEREO-A show that (1) the CME is unambiguously connected to the ICME and can be tracked all the way to 1 AU, (2) the particular arc-like morphology of the CME points to an inclined axis, and (3) the three-part structure of the CME may be plausibly related to the in situ data. This is a first step in predicting both the direction of travel and the internal structure of CMEs from complete remote observations between the Sun and 1 AU, which is one of the main requirements for forecasting the geo-effectiveness of CMEs.
The Astrophysical Journal
Digital Object Identifier (DOI)
Moestl, C.; Farrugia, C. J.; Temmer, M.; Miklenic, C.; Veronig, A. M.; Galvin, A. B.; Leitner, M.; Biernat, H. K. (2009). LINKING REMOTE IMAGERY OF A CORONAL MASS EJECTION TO ITS IN SITU SIGNATURES AT 1 AU, ASTROPHYSICAL JOURNAL LETTERS. Vol. 705, No. 2, L180-L185. DOI: 10.1088/0004-637X/705/2/L180