HR: 16:50h
AN: SH14B-04    [Abstracts]
TI: A New View of the Extreme Ultraviolet Corona from Wavelet-Processed EUV Images
AU: * Stenborg, G A
EM: stenborg@kreutz.nascom.nasa.gov
AF: Catholic University of America, NASA Goddard Space Flight Center Code 671.1, Greenbelt, MD 20771, United States
AU: Vourlidas, A
EM: vourlidas@nrl.navy.mil
AF: Naval Research Laboratory, Code 7660 4555 Overlook Ave. SW, Washington, DC 20375, United States
AU: Howard, R A
EM: russ.howard@nrl.navy.mil
AF: Naval Research Laboratory, Code 7660 4555 Overlook Ave. SW, Washington, DC 20375, United States
AB: Our knowledge of the structure and dynamics of the extreme ultraviolet solar corona has greatly increased over the last 11 years thanks to the observations from the Extreme-ultraviolet Imaging Telescope (EIT) aboard the SOHO spacecraft. The EIT images have revealed the early phases of coronal mass ejections (CMEs), discovered coronal waves associated with CMEs, recorded impressive post-CME loop systems and eruptive prominences, and detected reconnection at the base of coronal hole plumes, among other things. It would be natural to think that, by now, the EIT instrument has exhausted its discovery potential. We will demonstrate in this presentation that this is not the case. We have developed a wavelet-based image enhancement technique that exploits the multi-scale nature of the observed solar features, and treated the entire EIT database accordingly. The technique allowed us to remove the instrumental stray light background and enhance the fine coronal structures at the same time. The final images reveal such a wealth of structures and dynamics that they seem to have been obtained by a new instrument. The clarity of the enhanced images allows us to identify numerous and potentially interesting phenomena that were previously obscured by a background level that includes stray light and image noise. A few examples will be presented here, including application to the STEREO EUVI images. This presentation aims to bring the availability of this resource and its potential for significant discoveries to the attention of the solar physics community.
DE: 7509 Corona
DE: 7513 Coronal mass ejections (2101)
DE: 7594 Instruments and techniques
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting