skip to main content

SciTech ConnectSciTech Connect

Title: COMBINED MULTIPOINT REMOTE AND IN SITU OBSERVATIONS OF THE ASYMMETRIC EVOLUTION OF A FAST SOLAR CORONAL MASS EJECTION

We present an analysis of the fast coronal mass ejection (CME) of 2012  March 7, which was imaged by both STEREO spacecraft and observed in situ by MESSENGER, Venus Express, Wind, and Mars Express. Based on detected arrivals at four different positions in interplanetary space, it was possible to strongly constrain the kinematics and the shape of the ejection. Using the white-light heliospheric imagery from STEREO-A and B, we derived two different kinematical profiles for the CME by applying the novel constrained self-similar expansion method. In addition, we used a drag-based model to investigate the influence of the ambient solar wind on the CME's propagation. We found that two preceding CMEs heading in different directions disturbed the overall shape of the CME and influenced its propagation behavior. While the Venus-directed segment underwent a gradual deceleration (from ∼2700 km s{sup –1} at 15 R {sub ☉} to ∼1500 km s{sup –1} at 154 R {sub ☉}), the Earth-directed part showed an abrupt retardation below 35 R {sub ☉} (from ∼1700 to ∼900 km s{sup –1}). After that, it was propagating with a quasi-constant speed in the wake of a preceding event. Our results highlight the importance of studies concerning the unequal evolution of CMEs.more » Forecasting can only be improved if conditions in the solar wind are properly taken into account and if attention is also paid to large events preceding the one being studied.« less
Authors:
; ; ; ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5] ;  [6]
  1. IGAM-Kanzelhöhe Observatory, Institute of Physics, University of Graz, A-8010 Graz (Austria)
  2. Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238 (United States)
  3. RAL Space, Rutherford Appleton Laboratory, Harwell Oxford, OX11 0QX (United Kingdom)
  4. Hvar Observatory, Faculty of Geodesy, University of Zagreb, 1000 Zagreb (Croatia)
  5. Space Science Center and Department of Physics, University of New Hampshire, Durham, NH 03824 (United States)
  6. Space Research Institute, Austrian Academy of Sciences, A-8042 Graz (Austria)
Publication Date:
OSTI Identifier:
22365544
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 790; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ASYMMETRY; HELIOSPHERE; INTERPLANETARY SPACE; MARS PLANET; MASS; SOLAR CORONA; SOLAR WIND; SUN; VENUS PLANET; VISIBLE RADIATION