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http://hdl.handle.net/2248/5946
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DC Field | Value | Language |
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dc.contributor.author | Rajaguru, S. P | - |
dc.contributor.author | Couvidat, S | - |
dc.contributor.author | Sun, Xudong | - |
dc.contributor.author | Hayashi, K | - |
dc.contributor.author | Schunker, H | - |
dc.date.accessioned | 2012-12-13T09:55:34Z | - |
dc.date.available | 2012-12-13T09:55:34Z | - |
dc.date.issued | 2013-10 | - |
dc.identifier.citation | Solar Physics, Vol. 287, No. 1-2, pp. 107-127 | en |
dc.identifier.issn | 1573-093X | - |
dc.identifier.uri | http://hdl.handle.net/2248/5946 | - |
dc.description | Restricted Access | en |
dc.description | The original publication is available at springerlink.com | - |
dc.description.abstract | We study properties of waves of frequencies above the photospheric acoustic cut-off of ≈5.3 mHz, around four active regions, through spatial maps of their power estimated using data from the Helioseismic and Magnetic Imager (HMI) and Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). The wavelength channels 1600 Å and 1700 Å from AIA are now known to capture clear oscillation signals due to helioseismic p-modes as well as waves propagating up through to the chromosphere. Here we study in detail, in comparison with HMI Doppler data, properties of the power maps, especially the so-called “acoustic halos” seen around active regions, as a function of wave frequencies, inclination, and strength of magnetic field (derived from the vector-field observations by HMI), and observation height. We infer possible signatures of (magneto)acoustic wave refraction from the observation-height-dependent changes, and hence due to changing magnetic strength and geometry, in the dependencies of power maps on the photospheric magnetic quantities. We discuss the implications for theories of p-mode absorption and mode conversions by the magnetic field. | en |
dc.language.iso | en | en |
dc.publisher | Springer | en |
dc.relation.uri | http://dx.doi.org/10.1007/s11207-012-0180-9 | en |
dc.relation.uri | http://rd.springer.com/article/10.1007%2Fs11207-012-0180-9?null | en |
dc.rights | © Springer | en |
dc.subject | Active regions | en |
dc.subject | Magnetic fields | en |
dc.subject | Chromosphere | en |
dc.subject | Helioseismology | en |
dc.subject | Photosphere | en |
dc.subject | Magnetohydrodynamics | en |
dc.subject | Sunspots | en |
dc.subject | Waves, acoustic | - |
dc.title | Properties of High-Frequency Wave Power Halos Around Active Regions: An Analysis of Multi-height Data from HMI and AIA Onboard SDO | en |
dc.type | Article | en |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
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Properties of High-Frequency Wave Power Halos Around Active Region.pdf Restricted Access | Restricted Access | 1.51 MB | Adobe PDF | View/Open Request a copy |
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