Spectroscopic analysis of interaction between an EIT wave and a coronal upflow region

Abstract

We report a spectroscopic analysis of an EIT wave event that occurred in active region 11081 on 2010 June 12 and was associated with an M2.0 class flare. The wave propagated near circularly. The south-eastern part of the wave front passed over an upflow region nearby a magnetic bipole. Using EIS raster observations for this region, we studied the properties of plasma dynamics in the wave front, as well as the interaction between the wave and the upflow region. We found a weak blueshift for the Fe XII λ195.12 and Fe XIII λ202.04 lines in the wave front. The local velocity along the solar surface, which is deduced from the line of sight velocity in the wave front and the projection effect, is much lower than the typical propagation speed of the wave. A more interesting finding is that the upflow and non-thermal velocities in the upflow region are suddenly diminished after the transit of the wave front. This implies a significant change of magnetic field orientation when the wave passed. As the lines in the upflow region are redirected, the velocity along the line of sight is diminished as a result. We suggest that this scenario is more in accordance with what was proposed in the field-line stretching model of EIT waves.

13 pages, 7 figures, accepted for publication in ApJ

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• Quasi-periodic Fast-mode Wave Trains Within a Global EUV Wave and Sequential Transverse Oscillations Detected by SDO/AIA
• What can we learn about solar coronal mass ejections, coronal dimmings, and Extreme-Ultraviolet jets through spectroscopic observations?
• Large-scale Coronal Propagating Fronts in Solar Eruptions as Observed by the Atmospheric Imaging Assembly on Board the Solar Dynamics Observatory\,--\,An Ensemble Study
• On the Nature and Genesis of EUV Waves: A Synthesis of Observations from SOHO, STEREO, SDO, and Hinode
• Understanding the Physical Nature of Coronal "EIT Waves"
• A New Multi-wavelength Solar Telescope: Optical and Near-infrared Solar Eruption Tracer (ONSET)
• Measuring the Magnetic Field Strength of the Quiet Solar Corona Using "EIT Waves"
• SDO/AIA and Hinode/EIS Observations of Interaction Between an EUV Wave and Active Region Loops
• Global Coronal Waves
• The Chromospheric Response to the Sunquake generated by the X9.3 Flare of NOAA 12673
• A comparison of the active region upflow and core properties using simultaneous spectroscopic observations from IRIS and Hinode
• Slow solar wind sources. High-resolution observations with a quadrature view
• Dynamics in the transition region beneath active region upflows viewed by IRIS
• A coronal wave and an asymmetric eruptive filament in SUMER, CDS, EIT, and TRACE co-observations
• Flare Induced Sunquake Signatures in the Ultraviolet as Observed by the Atmospheric Imaging Assembly