Spectroscopic UV observations of M1.0 class solar flare from IRIS satellite

Viacheslav M. Sadykov, Alexander G. Kosovichev, Ivan N. Sharykin, Santiago Vargas Dominguez

Research output: Contribution to journalArticlepeer-review


This work presents an analysis of UV spectroscopic observations from the IRIS satellite of an M1.0 class flare occurred on 12 June 2014 in active region NOAA 12087. Our analysis of the IRIS spectra and Slit-Jaw images revealed presence of a strongly redshifted chromospheric jet before the flare. We also found strong emission of the chromospheric lines, and studied the C II 1334.5 Å line emission distribution in details. A blueshift of the Fe XXI line across the flaring region corresponds to evaporation flows of the hot chromospheric plasma with a speed of 50 km/s. Although the enhancement of the C II line integrated redshift correlates with the flare X-ray emission, we classify the evaporation as of a gentle type because of its long time scale and subsonic velocities. Analysis of X-ray data from the RHESSI satellite showed that both, an injection of accelerated particles and a heat flux from the energy release site can explain the energetics of the observed event.

Original languageEnglish (US)
Pages (from-to)64-67
Number of pages4
JournalProceedings of the International Astronomical Union
Issue numberS320
StatePublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: activity
  • UV radiation
  • atmosphere
  • flares
  • magnetic fields


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