High-resolution Observations of the Shock Wave Behavior for Sunspot Oscillations with the Interface Region Imaging Spectrograph

Abstract

We present the first results of sunspot oscillations from observations by the Interface Region Imaging Spectrograph. The strongly nonlinear oscillation is identified in both the slit-jaw images and the spectra of several emission lines formed in the transition region and chromosphere. We first apply a single Gaussian fit to the profiles of the Mgii 2796.35 Å, Cii 1335.71 Å, and Si iv 1393.76 Å lines in the sunspot. The intensity change is about 30%. The Doppler shift oscillation reveals a sawtooth pattern with an amplitude of about 10 km/s in Si iv. In the umbra the Si iv oscillation lags those of Cii and Mgii by about 3 and 12 s, respectively. The line width suddenly increases as the Doppler shift changes from redshift to blueshift. However, we demonstrate that this increase is caused by the superposition of two emission components. We then perform detailed analysis of the line profiles at a few selected locations on the slit. The temporal evolution of the line core is dominated by the following behavior: a rapid excursion to the blue side, accompanied by an intensity increase, followed by a linear decrease of the velocity to the red side. The maximum intensity slightly lags the maximum blueshift in Si iv, whereas the intensity enhancement slightly precedes the maximum blueshift in Mgii. We find a positive correlation between the maximum velocity and deceleration, a result that is consistent with numerical simulations of upward propagating magnetoacoustic shock waves.

5 figures, in ApJ. Correction of time lags (correct values are 3 and 12s) made on June 17 2014

References in corpus (23)

• Observing the Roots of Solar Coronal Heating - in the Chromosphere
• Dynamic Fibrils are driven by Magnetoacoustic Shocks
• High Resolution Observations and Modeling of Dynamic Fibrils
• Spectropolarimetric investigation of the propagation of magnetoacoustic waves and shock formation in sunspot atmospheres
• What can we learn about solar coronal mass ejections, coronal dimmings, and Extreme-Ultraviolet jets through spectroscopic observations?
• Two components of the coronal emission revealed by EUV spectroscopic observations
• Physical Properties of a Sunspot Chromosphere with Umbral Flashes
• Magnetoacoustic shocks as driver of quiet Sun mottles
• The Nature of Running Penumbral Waves Revealed
• The Influence of the Magnetic Field on Running Penumbral Waves in the Solar Chromosphere
• Numerical Simulations of Shock Wave-Driven Jets
• Ubiquitous High Speed Transition Region and Coronal Upflows in the Quiet Sun
• Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS
• Multi-layer study of wave propagation in sunspots
• Observing Episodic Coronal Heating Events Rooted in Chromospheric Activity
• Multiple Component Outflows in an Active Region Observed with the EUV Imaging Spectrometer on Hinode
• Spicule-like structures observed in 3D realistic MHD simulations
• Multi-height observations of magnetoacoustic cut-off frequency in a sunspot atmosphere
• Solar transition region above sunspots
• Sunspot transition region oscillations in NOAA 8156
• Magneto-acoustic wave energy from numerical simulations of an observed sunspot umbra
• Spectroscopic measurements of dynamic fibrils in the Ca {\small{II}} 8662 Å line
• Measurements of plasma motions in dynamic fibrils

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