The effects of transients on photospheric and chromospheric power distributions

Abstract

We have observed a quiet Sun region with the Swedish 1-meter Solar Telescope (SST) equipped with CRISP Imaging SpectroPolarimeter. High-resolution, high-cadence, H$\alpha$ line scanning images were taken to observe different layers of the solar atmosphere from the photosphere to upper chromosphere. We study the distribution of power in different period-bands at different heights. Power maps of the upper photosphere and the lower chromosphere show suppressed power surrounding the magnetic-network elements, known as "magnetic shadows". These also show enhanced power close to the photosphere, traditionally referred to as "power halos". The interaction between acoustic waves and inclined magnetic fields is generally believed to be responsible for these two effects. In this study we explore if small-scale transients can influence the distribution of power at different heights. We show that the presence of transients, like mottles, Rapid Blueshifted Excursions (RBEs) and Rapid Redshifted Excursions (RREs), can strongly influence the power-maps. The short and finite lifetime of these events strongly affects all powermaps, potentially influencing the observed power distribution. We show that Doppler-shifted transients like RBEs and RREs that occur ubiquitously, can have a dominant effect on the formation of the power halos in the quiet Sun. For magnetic shadows, transients like mottles do not seem to have a significant effect in the power suppression around 3 minutes and wave interaction may play a key role here. Our high cadence observations reveal that flows, waves and shocks manifest in presence of magnetic fields to form a non-linear magnetohydrodynamic system.

11 pages, 11 Figures, 4 movies (will be available online in ApJ). ApJ (accepted)

References in corpus (16)

• CRISP Spectropolarimetric Imaging of Penumbral Fine Structure
• CRISPRED: A data pipeline for the CRISP imaging spectropolarimeter
• Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
• An Interface Region Imaging Spectrograph first view on Solar Spicules
• Solar Atmospheric Oscillations and the Chromospheric Magnetic Topology
• Search for high velocities in the disk counterpart of type II spicules
• Channeling 5-min photospheric oscillations into the solar outer atmosphere through small-scale vertical magnetic flux tubes
• The Influence of the Magnetic Field on Running Penumbral Waves in the Solar Chromosphere
• 3D Temperature Mapping of Solar Photospheric Fine Structure Using Ca II H Filtergrams
• Heating signatures in the disk counterparts of solar spicules in IRIS observations
• The Dynamics of Rapid Redshifted and Blueshifted Excursions in the Solar Halpha line
• Quiet Sun Hα Transients and Corresponding Small-Scale Transition Region and Coronal Heating
• 3D simulations of realistic power halos in magneto-hydrostatic sunspot atmospheres: linking theory and observation
• Nature of Quiet Sun Oscillations Using Data from the Hinode, TRACE, and SOHO Spacecraft
• Transmission and conversion of magnetoacoustic waves on the magnetic canopy in a quiet Sun region
• Oscillatory behavior of chromospheric fine structures in a network and a semi-active regions

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