The March 11, 2015 X2.1 flare: peculiar post-flare spectral signatures

Daniela A. Lacatus, Alina Donea, Philip G Judge

Research output: Contribution to conferenceAbstractpeer-review


The only X-class flare of 2015 observed by IRIS occurred at 16:22 UT on 11 March 2015, in AR 12297. This flare generated significant seismic transients in the photosphere at the eastern location of the flare. IRIS observations of the chromosphere and transition region help us understand the physics of the sunquake. In this work we will analyze this event using data from IRIS, SDO, and RHESSI. Unfortunately, the IRIS rasters scanned the area between the main footpoints of the solar flare. Whereas, the main X-ray emission dominates the eastern footprint. Significant enhancements in the chromospheric and TR lines intensities were measured. The forbidden line of Fe XXI 1354.1 Å is detected after the flare peak. Important plasma downflows were identified in the majority of the observed lines, consistent with magnetic field reconfiguration. An erupting filament develops at 16:12 UT and moves rapidly towards the eastern part of the active region.
Original languageEnglish
Number of pages1
Publication statusPublished - Jul 2016
EventSolar Heliospheric and INterplanetary Environment Conference 2016: SHINE 2016 - Santa Fe, United States of America
Duration: 10 Jul 201615 Jul 2016


ConferenceSolar Heliospheric and INterplanetary Environment Conference 2016
Country/TerritoryUnited States of America
CitySanta Fe

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