Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.3503c&link_type=abstract
American Astronomical Society, SPD meeting #40, #35.03; Bulletin of the American Astronomical Society, Vol. 41, p.867
Other
Scientific paper
The EUV Variability Experiment (EVE) will be launched onboard the Solar Dynamics Observatory (SDO) later this year. EVE will provide continued observations of the solar EUV spectral irradiance that were started by its predecessor, the Solar EUV Experiment (SEE), that was launched in 2002 during the maximum of solar cycle 23. EVE measurements will help to quantify the changes in the solar EUV irradiance over various timescales from solar cycle (years to decades), solar rotation (days to months), and solar flares (minutes to hours). These changes in radiative output are largely driven by changes in the solar magnetic field, and will be complimentary to the other two instruments onboard SDO, the Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA). EVE will observe the entire spectrum from 0.1-106 nm, as well as Lyman-alpha emission at 121.6, every 10 seconds with almost a 100% duty cycle. This spectral range includes many bound-bound line and free-bound continuum emissions that range in formation altitudes and temperatures in the solar atmosphere from the chromosphere (log T of 4.4) to upper corona (log T of >6.4). Along with the improved accuracy of EVE over SEE, it will also measure the solar irradiance at the higher spectral resolution of 0.1 nm from 6-106 nm and 1.0 nm from 0.1-6 nm. Results of solar cycle and solar rotational irradiance variability observed by SEE will be presented, and also how these measurements will be improved by EVE. Also shown will be estimated changes in the spectral irradiance that occur during flares based on a few SEE measurements, and how EVE observations will dramatically advance our knowledge of flares.
Chamberlin Phillip C.
Didkovsky Leonid
Eparvier Francis G.
Judge Darrell
Woods Thomas N.
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