Time-Dependent Density Diagnostics of Solar Flare Plasmas Using SDO/EVE

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Abstract

Temporally resolved electron density measurements of solar flare plasmas are presented using data from the EUV Variability Experiment (EVE) on board the Solar Dynamics Observatory. The EVE spectral range contains emission lines formed between 104 and 107 K, including transitions from highly ionized iron (gsim10 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.
Original languageEnglish
Article numberL16
Pages (from-to)1-6
Number of pages6
JournalAstrophysical Journal Letters
Volume755
Early online date26 Jul 2012
DOIs
Publication statusPublished - 10 Aug 2012

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

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