Science Seminars

9/30/2010 – First Results from SDO Extreme Ultraviolet Variability Experiment (EVE)

Speaker: Tom Woods, Rachel Hock, Frank Eparvier, and Andrew Jones
Date: Thursday, Sep 30, 2010
Time: 4:00pm
Location: LSTB-299

Seminar Abstract:

The Extreme ultraviolet Variability Experiment (EVE) aboard the NASA Solar Dynamics Observatory (SDO) was launched on 11 February 2010. 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). This seminar will discuss some of the first results from the SDO observations.

The Flood (Woods): The data rate from EVE observations is a mere 7 Mbps (as compared to the 140 Mbps from the SDO imagers), and yet three months of EVE observations are more data than LASP has obtained from all previous satellite observations over the 60 year history of LASP. Introduction to the SDO mission and EVE observations will be given.

The Flares (Hock): Despite this solar cycle 24 being a slow start, EVE has observed more than 30 flares, albeit small C-class and a few moderate M-class flares. An overview of the flare observations will be given.

The Fluctuations (Eparvier): One of our surprises in the flare observations is that EVE observes a second peak many minutes, even hours, after the main flare peak in some coronal emission lines. In addition, some of the lines decrease after a flare, and some show similar fluctuations when no earlier flare is apparent. These interesting observations and possible explanation will be presented.

The Forecast (Jones): Forecasting flares is one of the goals for the EVE program. The progress in making accurate forecast of the flare magnitude using EVE data will be presented.