Solar Atmospheric Oscillations and the Chromospheric Magnetic Topology
| dc.creator | Vecchio, A. | |
| dc.creator | Cauzzi, G. | |
| dc.creator | Reardon, K. P. | |
| dc.creator | Janssen, K. | |
| dc.creator | Rimmele, T. | |
| dc.date | 2006-11-07 | |
| dc.date.accessioned | 2026-07-07T07:43:24Z | |
| dc.date.available | 2026-07-07T07:43:24Z | |
| dc.description | We investigate the oscillatory properties of the quiet solar chromosphere in relation to the underlying photosphere, with particular regard to the effects of the magnetic topology. We perform a Fourier analysis on a sequence of line-of-sight velocities measured simultaneously in a photospheric (Fe I 709.0 nm) and a chromospheric line (Ca II 854.2 nm). The velocities were obtained from full spectroscopic data acquired at high spatial resolution with the Interferometric BIdimensional Spectrometer (IBIS). The field of view encompasses a full supergranular cell, allowing us to discriminate between areas with different magnetic characteristics. We show that waves with frequencies above the acoustic cut-off propagate from the photosphere to upper layers only in restricted areas of the quiet Sun. A large fraction of the quiet chromosphere is in fact occupied by ``magnetic shadows'', surrounding network regions, that we identify as originating from fibril-like structures observed in the core intensity of the Ca II line. We show that a large fraction of the chromospheric acoustic power at frequencies below the acoustic cut-off, residing in the proximity of the magnetic network elements, directly propagates from the underlying photosphere. This supports recent results arguing that network magnetic elements can channel low-frequency photospheric oscillations into the chromosphere, thus providing a way to input mechanical energy in the upper layers. | |
| dc.description | 4 pages, 3 figure, A&A Letters in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0611206 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0611206 | |
| dc.identifier | Astron.Astrophys. 461 (2007) L1-L4 | |
| dc.identifier | doi:10.1051/0004-6361:20066415 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/122811 | |
| dc.subject | Astrophysics | |
| dc.title | Solar Atmospheric Oscillations and the Chromospheric Magnetic Topology | |
| dc.type | text |