Spatial Distributions of Sunspot Oscillation Modes at Different Temperatures

Abstract

Three- and five-minute oscillations of sunspots have different spatial distributions in the solar atmospheric layers. The spatial distributions are crucial to reveal the physical origin of sunspot oscillations and to investigate their propagation. In this study, six sunspots observed by Solar Dynamics Observatory/Atmospheric Imaging Assembly were used to obtain the spatial distributions of three- and five-minute oscillations. The fast Fourier transform method is applied to represent the power spectra of oscillation modes. We find that, from the temperature minimum to the lower corona, the powers of the five-minute oscillation exhibit a circle-shape distribution around its umbra, and the shapes gradually expand with temperature increase. However, the circle-shape is disappeared and the powers of the oscillations appear to be very disordered in the higher corona. This indicates that the five-minute oscillation can be suppressed in the high-temperature region. For the three-minute oscillations, from the temperature minimum to the high corona, their powers mostly distribute within an umbra, and part of them locate at the coronal fan loop structures. Moreover, those relative higher powers are mostly concentrated in the position of coronal loop footpoints.

References in corpus (8)

• A simple test for periodic signals in red noise
• Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
• The Source of Three-minute Magneto-acoustic Oscillations in Coronal Fans
• Observations of Sunspot Oscillations in G band and Ca II H line with Solar Optical Telescope on Hinode
• Coronal Fourier power spectra: implications for coronal seismology and coronal heating
• Oscillations above sunspots from the temperature minimum to the corona
• Height distribution of the power of 3-min oscillations over sunspots
• Peculiarity of the oscillation stratification in sunspot penumbrae

Cited by in corpus (9)

• Quasi-periodic pulsation detected in Lyman-alpha emission during solar flares
• Detections of Multi-Periodic Oscillations during a Circular Ribbon Flare
• Estimating red noise in quasi-periodic signals with MCMC-based Bayesian
• Diagnosing a Solar Flaring Core with Bidirectional Quasi-Periodic Fast Propagating Magnetoacoustic Waves
• Application of a magnetic-field-induced transition in Fe X to solar and stellar coronal magnetic field measurements
• Propagating Slow Sausage Waves in a Sunspot Observed by the New Vacuum Solar Telescope
• Site-testing at the Muztagh-ata Site.V. Nighttime Cloud Amount during the Last Five Years
• Doppler shift oscillations of a sunspot detected by CYRA and IRIS
• Quasi-Periodic Pulsations Detected in Ly$\alpha$ and Nonthermal Emissions During Solar Flares