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Time-Dependent Density Diagnostics of Solar Flare Plasmas Using SDO/EVE View all abstracts by submitter

Ryan Milligan   Submitted: 2012-07-05 10:02

Temporally-resolved electron density measurements of solar flare plasmas are presented using data from the EUV Variability Experiment (EVE) onboard the Solar Dynamics Observatory (SDO). The EVE spectral range contains emission lines formed between 104-107 K, including transitions from highly ionized iron (>10 MK). Using three density-sensitive Fe XXI ratios, peak electron densities of 1011.2-1012.1 cm-3 were found during four X-class flares. While previous measurements of densities at such high temperatures were made at only one point during a flaring event, EVE now allows the temporal evolution of these high-temperature densities to be determined at 10 s cadence. A comparison with GOES data revealed that the peak of the density time profiles for each line ratio correlated well with that of the emission measure time profile for each of the events studied.

Authors: Ryan O. Milligan, Michael B. Kennedy, Mihalis Mathioudakis, Francis P. Keenan
Projects: SDO-EVE

Publication Status: ApJL, accepted
Last Modified: 2012-07-07 14:50
Go to main E-Print page  How Many CMEs Have Flux Ropes? Deciphering the Signatures of Shocks, Flux Ropes, and Prominences in Coronagraph Observations of CMEs  Principal Component Analysis of Background and Sunspot Magnetic Field Variations During Solar Cycles 21-23  Edit Entry  Download Preprint  Delete Entry 

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