Abstract
While the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO) provides Doppler-velocity [V], continuum-intensity [I C], and line-depth [Ld] observations, each of which is sensitive to the five-minute acoustic spectrum, the Atmospheric Imaging Array (AIA) also observes at wavelengths – specifically the 1600 and 1700 Å bands – that are partly formed in the upper photosphere and have good sensitivity to acoustic modes. In this article we consider the characteristics of the spatio–temporal Fourier spectra in AIA and HMI observables for a 15-degree region around NOAA Active Region 11072. We map the spatio–temporal-power distribution for the different observables and the HMI Line Core [I L], or Continuum minus Line Depth, and the phase and coherence functions for selected observable pairs, as a function of position and frequency. Five-minute oscillation power in all observables is suppressed in the sunspot and also in plage areas. Above the acoustic cut-off frequency, the behaviour is more complicated: power in HMI I C is still suppressed in the presence of surface magnetic fields, while power in HMI I L and the AIA bands is suppressed in areas of surface field but enhanced in an extended area around the active region, and power in HMI V is enhanced in a narrow zone around strong-field concentrations and suppressed in a wider surrounding area. The relative phases of the observables and their cross-coherence functions are also altered around the active region. These effects may help us to understand the interaction of waves and magnetic fields in the different layers of the photosphere and will need to be taken into account in multi-wavelength local-helioseismic analysis of active regions.
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Acknowledgements
RH thanks the National Solar Observatory for computing support, and Yvonne Elsworth for useful discussions. We also thank A.G. Kosovichev for useful comments on the manuscript. SDO data courtesy SDO (NASA) and the AIA and HMI consortia. This work was partly supported by NASA grant NNH12AT11I to NSO. This research has made use of NASA’s Astrophysics Data System.
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Howe, R., Jain, K., Bogart, R.S. et al. Two-Dimensional Helioseismic Power, Phase, and Coherence Spectra of Solar Dynamics Observatory Photospheric and Chromospheric Observables. Sol Phys 281, 533–549 (2012). https://doi.org/10.1007/s11207-012-0097-3
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DOI: https://doi.org/10.1007/s11207-012-0097-3