Measuring temperature - dependent propagating disturbances in coronal fan loops using multiple SDO/AIA channels and surfing transform technique
arXiv:1308.6195 · doi:10.1088/0004-637X/778/1/26
Abstract
A set of co-aligned high resolution images from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) is used to investigate propagating disturbances (PDs) in warm fan loops at the periphery of a non-flaring active region NOAA AR 11082. To measure PD speeds at multiple coronal temperatures, a new data analysis methodology is proposed enabling quantitative description of subvisual coronal motions with low signal-to-noise ratios of the order of 0.1 %. The technique operates with a set of one-dimensional "surfing" signals extracted from position-time plots of several AIA channels through a modified version of Radon transform. The signals are used to evaluate a two-dimensional power spectral density distribution in the frequency - velocity space which exhibits a resonance in the presence of quasi-periodic PDs. By applying this analysis to the same fan loop structures observed in several AIA channels, we found that the traveling velocity of PDs increases with the temperature of the coronal plasma following the square root dependence predicted for the slow mode magneto-acoustic wave which seems to be the dominating wave mode in the studied loop structures. This result extends recent observations by Kiddie et al. (Solar Phys., 2012) to a more general class of fan loop systems not associated with sunspots and demonstrating consistent slow mode activity in up to four AIA channels.
23 pages, 8 figures, 2 tables
References in corpus (21)
- A Tale Of Two Spicules: The Impact of Spicules on the Magnetic Chromosphere
- Persistent Doppler shift oscillations observed with HINODE/EIS in the solar corona: spectroscopic signatures of Alfvenic waves and recurring upflows
- Quasi-periodic Propagating Signals in the Solar Corona: The Signature of Magnetoacoustic Waves or High-Velocity Upflows?
- Evidence for Widespread Cooling in an Active Region Observed with the SDO Atmospheric Imaging Assembly
- Two components of the coronal emission revealed by EUV spectroscopic observations
- Hinode/EIS observations of propagating low-frequency slow magnetoacoustic waves in fan-like coronal loops
- The Spectroscopic Signature of Quasi-periodic Upflows in Active Region Timeseries
- Patterns of Nanoflare Storm Heating Exhibited by an Active Region Observed with SDO/AIA
- Observation of High-speed Outflow on Plume-like Structures of the Quiet Sun and Coronal Holes with SDO/AIA
- Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS
- 3D Coronal Slow Modes: Towards 3D Seismology
- Slow magnetosonic waves and fast flows in active region loops
- The Temperature Dependence of Solar Active Region Outflows
- Velocity measurements for a solar active region fan loop from Hinode/EIS observations
- Omnipresent long-period intensity oscillations in open coronal structures
- On The Doppler Velocity of Emission Line Profiles Formed in the "Coronal Contraflow" that is the Chromosphere-Corona Mass Cycle
- Propagating Disturbances in Coronal Loops: A Detailed Analysis of Propagation Speeds
- Benchmarking atomic data for astrophysics: a first look at the soft X-ray lines
- Continuous upflows and sporadic downflows observed in active regions
- Temporal Variability of Active Region Outflows
- Three-dimensional MHD modeling of propagating disturbances in fan-like coronal loops
Cited by in corpus (19)
- Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
- Slow-Mode Magnetoacoustic Waves in Coronal Loops
- Observations and Implications of Large-Amplitude Longitudinal Oscillations in a Solar Filament
- Frequency-dependent damping in propagating slow magneto-acoustic waves
- Quasiperiodic Energy Release and Jets at the Base of Solar Coronal Plumes
- Upflows in the upper solar atmosphere
- The polytropic index of solar coronal plasma in sunspot fan loops and its temperature dependence
- Statistical study of network jets observed in the solar transition region: A comparison between coronal holes and quiet sun regions
- Waves in Solar Coronal Loops
- Plumelets: Dynamic Filamentary Structures in Solar Coronal Plumes
- Observations of Dissipation of Slow Magneto-acoustic Waves in a Polar Coronal Hole
- An Automated Algorithm for Identifying and Tracking Transverse Waves in Solar Images
- Stochastic transients as a source of quasi-periodic processes in the solar atmosphere
- Effect of Thermal Conductivity, Compressive Viscosity and Radiative Cooling on the Phase Shift of Propagating Slow Waves with and without Heating-Cooling Imbalance
- Excitation of flare-induced waves in coronal loops and the effects of radiative cooling
- Reconnection generated plasma flows in the quasi-separatrix layer in localised solar corona
- Phase speed and frequency-dependent damping of longitudinal intensity oscillations in coronal loop structures observed with AIA/SDO
- SynCOM: An Empirical Model for High-Resolution Simulations of Transient Solar Wind Flows
- Thermodynamic Evolution of Plumes