Computer Science – Sound
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21b05t&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP21B-05
Computer Science
Sound
7509 Corona, 7549 Ultraviolet Emissions, 7594 Instruments And Techniques
Scientific paper
GSFC is in the process of assembling an Extreme-Ultraviolet Normal-Incidence Spectrometer called EUNIS, to be flown as a sounding rocket payload. This instrument builds on the many technical innovations pioneered by our highly successful SERTS experiment, which has now flown a total of ten times, most recently last summer. The new design will have somewhat improved spatial and spectral resolutions, as well as two orders of magnitude greater sensitivity, permitting high signal/noise EUV spectroscopy with a temporal resolution near 1~second for the first time ever. In order to achieve such high time cadence, a novel detector system is being developed, based on Active-Pixel-Sensor electronics, a key component of our design. The high sensitivity of EUNIS will allow entirely new studies of transient coronal phenomena, such as the rapid loop dynamics seen by TRACE, and searches for non-thermal motions indicative of magnetic reconnection or wave heating. Another observing mode will be to raster a two dimensional region on the disk, giving data on much larger solar areas than could be covered with SERTS. The increased sensitivity will also permit useful EUV spectra at heights of 2--3~Rsun above the limb, where the transition between the static corona and the solar wind might occur. In addition, the new design features two independent optical systems, which more than double the spectral bandwidth covered on each flight. Its 300--370Å bandpass includes He~II 304Å and strong lines from Fe~XI--XVI, extending the current SERTS range of 300--355Å to further improve our ongoing series of calibration under-flights for SOHO/CDS and EIT. The second bandpass of 170--230Å has a sequence of very strong Fe~IX--XIV lines, and will allow under-flight support for two more channels on SOHO/EIT, two channels on TRACE, one on Solar-B/EIS, and all four channels on the STEREO/EUVI instrument. First flight of the new EUNIS payload is scheduled for 2002 October from White Sands Missile Range, New Mexico. This work is supported under NASA RTOP 344-17-38.
Davila Jose Manuel
Thomas Robert J.
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