Power distribution of oscillations in the atmosphere of a plage region: Joint observations with ALMA, IRIS and SDO

Abstract

We present a statistical analysis of power distribution of oscillations in a plage region in active region NOAA AR12651, observed jointly with ALMA (Atacama Large Millimeter/Submillimeter Array), IRIS (Interface Region Imaging Spectrograph), and SDO (Solar Dynamics Observatory). We employ coordinated ALMA Band-6 (1.25 mm) brightness temperature maps, IRIS Slit-Jaw Images in 2796 Å passband, and observations in six passbands (1600 Å, 304 Å, 131 Å, 171 Å, 193 Å and 211 Å) of AIA (Atmospheric Imaging Assembly) onboard SDO. We perform Lomb-Scargle transforms to study the distribution of oscillation power over the observed region by means of dominant period maps and power maps. We study spatial association of oscillations through the atmosphere mapped by the different passbands, with focus on the correlation of power distribution of ALMA oscillations with others. We do not observe any significant association of ALMA oscillations with IRIS and AIA oscillations. While the global behavior of ALMA dominant oscillations shows similarity with that of transition region and coronal passbands of AIA, the ALMA dominant period maps and power maps do not show any correlation with those from the other passbands. The spatial distribution of dominant periods and power in different period intervals of ALMA oscillations is uncorrelated with any other passband. We speculate the non-association of ALMA oscillations with those of IRIS and AIA be due to significant variations in the height of formation of the millimeter continuum observed by ALMA. Additionally, the fact that ALMA directly maps the brightness temperature, in contrast to the intensity observations by IRIS and AIA, can result in the very different intrinsic nature of the ALMA oscillations compared to the IRIS and AIA oscillations.

Accepted for publication in A&A; abstract abridged to meet arXiv requirements

References in corpus (12)

• High Resolution Observations and Modeling of Dynamic Fibrils
• Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
• Coupling from the photosphere to the chromosphere and the corona
• Structure and Dynamics of Isolated Internetwork Ca II H Bright Points Observed by Sunrise
• Millimeter radiation from a 3D model of the solar atmosphere I. Diagnosing chromospheric thermal structure
• Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI
• A First Comparison of Millimeter Continuum and Mg II Ultraviolet Line Emission from the Solar Chromosphere
• The solar chromosphere at millimetre and ultraviolet wavelengths. I. Radiation temperatures and a detailed comparison
• H-alpha features with hot onsets III. Fibrils in Lyman-alpha and with ALMA
• High-resolution observations of active region moss and its dynamics
• Propagation of Waves above a Plage as Observed by IRIS and SDO
• ALMA and IRIS Observations of the Solar Chromosphere II: Structure and Dynamics of Chromospheric Plage