Solar Mass Ejection Imager (SMEI) 3-D reconstruction of density enhancements behind interplanetary shocks: In-situ comparison near Earth and at STEREO

J. Atmospheric and Solar-Terrestrial Physics 73 (11-12), 1317−1329, 2011

Solar Mass Ejection Imager (SMEI) 3-D reconstruction of density enhancements behind interplanetary shocks: In-situ comparison near Earth and at STEREO

B.V. Jackson and M.S. Hamilton
Center for Astrophysics and Space Sciences, Univ. of California, San Diego, CA

P.P. Hick
Center for Astrophysics and Space Sciences, Univ. of California, San Diego, CA
San Diego Supercomputer Center, Univ. of California, San Diego, CA

A. Buffington
Center for Astrophysics and Space Sciences, Univ. of California, San Diego, CA

M.M. Bisi
Center for Astrophysics and Space Sciences, Univ. of California, San Diego, CA
Inst. of Mathematics and Physics, Aberystwyth Univ., Aberystwyth, UK

J. Clover
Center for Astrophysics and Space Sciences, Univ. of California, San Diego, CA

M. Tokumaru and K. Fujiki
Solar-Terrestrial Environment Lab. (STELab), Univ. of Nagoya, Nagoya, Japan

Abstract

SMEI and IPS remotely observe increased brightness and velocity enhancements behind interplanetary shocks that are also seen in situ. We use the UCSD time-dependent 3-D reconstruction technique to map these enhancements, and compare them with measurements at the SOHO, Wind, ACE, and STEREO spacecraft. The analyses of these shocks from hour-averaged in-situ data show that the enhanced density column associated with the shock response varies considerably between different instruments, even for in-situ instruments located at L1 near Earth. The relatively-low-resolution SMEI 3-D reconstructions generally show density enhancements, and within errors, the column excesses match those observed in situ. In these SMEI 3-D reconstructions from remotely-sensed data, the shock density enhancements appear not as continuous broad fronts, but as segmented structures. This may provide part of the explanation for the observed discrepancies between the various in-situ measurements at Earth and STEREO, but not between individual instruments near L1.