Accession Number:

ADA522195

Title:

Tracking Nonradial Motions and Azimuthal Expansions of Interplanetary CMEs with the Solar Mass Ejection Imager

Descriptive Note:

Conference paper

Corporate Author:

AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE

Personal Author(s):

Report Date:

2010-01-01

Pagination or Media Count:

5.0

Abstract:

The trajectories of interplanetary CMEs ICMEs are modified by their interactions with solar wind streams. These interactions can result in non-radial deflections of ICME trajectories and changes to their rates of azimuthal expansion. The Solar Mass Ejection Imager SMEI, launched earlier in 2003 January, has provided heliospheric images of several hundred ICMEs during the declining portion of solar cycle 23. We selected three SMEI ICMEs, each traversing a range of solar elongation angles e 20 degrees, and measured the time changes of their leading-edge profiles plotted against position angle, PA. The parabolic fits to those profiles yielded the propagation directions of the ICMEs as well as their leading-edge curvatures and time profiles. The selected ICMEs were associated with LASCO CMEs, so we tracked the PA variations in their propagation over 1 to 3-day periods. We found good fits for two of the ICMEs, but one yielded generally poor fits.

Subject Categories:

  • Astrophysics
  • Celestial Mechanics
  • Test Facilities, Equipment and Methods
  • Miscellaneous Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE