Abstracts submitted by Frederic Auchere
FESTIVAL: A Multiscale Vizualisation Tool for Solar Data
E. Soubrie [1], F. Auchere [1], K. Bocchialini [2]
[1] Institut d'Astrophsyique Spatiale
Since 4 December 2006, the SECCHI instrument suites onboard the STEREO A and B probes have been imaging the solar corona and the heliosphere on a very large range of angular scales. The EUVI telescopes have a plate scale of 1.7 arcsec/pixel, while that of the HI2 wide-angle cameras is 2.15 arcmin/pixel, almost two orders of magnitude larger, with the COR1 and COR2 coronagraphs having intermediate plate scales. These very different instruments aimed at studying Coronal Mass Ejections from their initiation to their propagation in the heliosphere, represent a data visualization challenge. We present here FESTIVAL, a SolarSoftware package that is able to dynamically map the SECCHI data into composite images of the sky as seen by the STEREO and SOHO probes. The user can quickly and easily zoom in and out and pan through these composite images to explore all scales from EUVI to HI2 while keeping the native resolution of the original data. A large variety of filters can be applied to the data. This new tool has proven to be very convenient in tracking CME fronts across the fields of view of the various instruments. FESTIVAL will soon be able to manage data from several other instruments. |
The 3D distribution of EUV flux in the heliosphere. Insights from STEREO.
F. Auchere[1], D. McMullin[2], J. Newmark[2], J. Cook[2], M. Witte[3], R. VonSteiger[4], E. Quemerais[1]
[1] Institut d'Astrophysique Spatiale
[2] Naval Research Laboratory
[3] MaxPlanck Institute
[4] International Space Science Institute
Using in-ecliptic data from EIT/SOHO, the authors have shown that the distribution of the EUV flux is significantly anisotropic, the flux being lower at high heliographic latitutdes. However, the prediction of the EUV flux at any position in the heliosphere is limited by the fact that generally only one hemisphere of the Sun is observed. This situation has changed since the launch of the STEREO probes. Indeed, with the increasing separation of the spacecraft, a larger fraction of the Sun is being observed simultaneously. We investigate the new solar flux forecasting capabilities offered by the unique position of the STEREO probes. |
A first look at the propagation of CMEs through the Heliosphere with SECCHI/STEREO
F. Auchere & the SECCHI team
Institut d'Astrophysique Spatiale
The SECCHI instrument suite on board the STEREO probes give us unprecedented views of our Sun. Especially, SECCHI offers the possibility to track CMEs from their initiation site to their propagation in the heliosphere. We present preliminary results combining observations from the 5 SECCHJI instruments. |
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