Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33d..03r&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH33D-03
Astronomy and Astrophysics
Astrophysics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections, [7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields
Scientific paper
On 2011 March 21, the Solar-Terrestrial Relations Observatory (STEREO) imaged the launch (at ~02:10UT) and outward propagation of a fast (>1300 km s-1) and wide (latitudinal extent greater than 90 degrees) coronal mass ejection (CME) which emerged W135 degrees (behind the west-limb as viewed from near-Earth spacecraft). Protons with energies exceeding 90 MeV were first detected by the STEREO-Ahead (STA) spacecraft and a few minutes later by near-Earth orbiting spacecraft. Velocity dispersion analyses of energetic electrons, protons and heavier ions, put the solar particle release (SPR) times along magnetic field lines connected to STA at ~02:30UT and along magnetic field lines connected to near-Earth spacecraft at ~ 03:00UT. The spatial evolution of a pressure wave and its associated shock forming around the CME could be tracked using (critical) high-cadence and high-resolution STA (extreme ultraviolet and white-light) images. We demonstrate that the delay between the SEP onset at STA and Earth is consistent with the time required for the pressure wave to propagate from the launch-site of the CME to the base of coronal streamers that are magnetically connected to near-Earth spacecraft. By considering measured shock speeds and inferred shock geometries along different longitudes and by deriving spectra of energetic protons, this study also presents some interpretation of the longitudinal variability of the SEP event in terms of the evolution of the compression wave. Time permitting, we will also summarise the results of similar analyses carried out for the other energetic CME events in 2010 and 2011.
Cohen M. C.
Mason Glenn M.
Ng Chee K.
Rouillard Alexis P.
Sheeley Neil R.
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