Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0902h&link_type=abstract
American Astronomical Society, SPD meeting #42, #9.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Physics
Scientific paper
The Extreme ultraviolet Variability Experiment (EVE) onboard Solar Dynamic Observatory (SDO), part of NASA's Living With the Star (LWS) program launched on 11 February 2010. Normal science operations began 1 May 2010 and have continued uninterrupted since then. The EVE instruments measure the solar extreme ultraviolet (EUV) irradiance from 0.1 to 105 nm with unprecedented spectral resolution (0.1 nm), temporal cadence (10 sec minimum), and accuracy (20% or better). Here, we present a review of the first year of EVE observations and initial science results presented at the LWS/SDO-1 Workshop held 1-5 May 2011 in Squaw Valley, CA. Much of the initial science from EVE has focused on the changes in the EUV irradiance due to solar flares. In the first eleven months of science operations, EVE observed over 350 C-class flares, 43 M-class flares, and 2 X-class flares. The location of a solar flare is important for understanding the EUV irradiance. ESP data is available in near-real time and uses a quadrant detector to determine the location of a solar flare. Preliminary location results are presented and compared to the location provided by both NOAA and AIA through the Heliophysics Events Knowledgebase (HEK). From EVE observations, we have noticed that flares of similar GOES class can have significant differences in the amount and timing of the increase of EUV irradiance due to the flare. From this, we have classified flares based on the topology in AIA observations to explore the implications for modeling the EUV irradiance of solar flares. In some solar flares, certain lines such as Fe IX (17.1 nm) actually decrease due to the ejection of material. The use of EVE spectral irradiance measurements as diagnostics of coronal mass ejections (CMEs) is explored.
Didkovsky Leonid
Eparvier Francis G.
Hock Rachel
Jones Andrew R.
Woods Thomas N.
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