{"paper":{"title":"Multi-height observations of magnetoacoustic cut-off frequency in a sunspot atmosphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Ding Yuan, R. Sych, V. E. Reznikova, V. M. Nakariakov","submitted_at":"2012-11-22T03:36:32Z","abstract_excerpt":"We used the Pixelised Wavelet Filtering (PWF) method to compute narrow-band power maps of SDO/AIA imaging datasets in the 1700 \\AA{}, 1600 \\AA{} and 304 \\AA{} bandpasses that correspond to different heights. The cut-off frequency was defined as contours where the spectral power droped to the median level. It was measured as a function of the spatial location. We inferred the magnetic field inclination according to the MAG wave theory in the low-$\\beta$ limit and compared it with the potential field extrapolation.{We analysed intensity oscillations in a symmetric sunspot AR11131(08 Dec 2010) an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1211.5196","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}