Deflected Propagation ---- A Factor Deciding the Geoeffectiveness of A CME

Details Deflected Propagation ---- A Factor Deciding the Geoeffectiveness of A CME Deflected Propagation ---- A Factor Deciding the Geoeffectiveness of A CME

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh43c..02w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH43C-02

Astronomy and Astrophysics

Astrophysics

[2100] Interplanetary Physics, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7900] Space Weather

Scientific paper

To answer the question if a CME can cause a significant change of the states of geo-space, the first issue we have to address is whether or not the CME will intersect with the Earth or what the trajectory of the CME is. From several observational cases and statistical studies, we show that the deflected propagations of CMEs are a common phenomenon. The amount of the deflection could be as large as several tens degrees in either latitude, longitude or both. Thus, an on-disk CME may not necessarily encounter the Earth, while a limb CME may be able to hit the Earth. Roughly, the CMEs' deflections can be classified as two different kinds. One is the deflection occurring in the corona, in which the CME's trajectory is controled by the distribution of the energy density of undisturbed coronal magnetic field. The other is that happenning in the IP space and in the ecliptic plane, in which the direction of the CME's propagation will be changed by the preceding or trailing background solar wind plasma depending on the velocity difference between the CME and ambient solar wind. Two models are proposed to describe the two different CME deflection behaviors, respectively. By applying the models to several cases, we may show that the trajectories of these CMEs predicted by the models match the observations fairly well.

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