Magnetic Topology and Wave Propagation in the Solar Atmosphere

Details Magnetic Topology and Wave Propagation in the Solar Atmosphere Magnetic Topology and Wave Propagation in the Solar Atmosphere

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh13c..01l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH13C-01

Astronomy and Astrophysics

Astrophysics

2752 Mhd Waves And Instabilities, 7500 Solar Physics, Astrophysics, And Astronomy, 7507 Chromosphere

Scientific paper

We analyze a 9 hr sequence of simultaneous, high resolution, 21 s cadence SVST G-band and K-line solar filtergrams plus magnetograms of lower cadence and resolution. The data include both network and internetwork areas (Berger and Title 2001, Cadavid, et al. 2003, Lawrence, et al. 2003). Time series of the G-band and K-line data are compared after filtering by a Morlet wavelet transform of period 2.5 min. On the average, the K-line signal is delayed by several seconds after the G-band signal Δ T = 8.6 ± 0.1 s for weak (|BZ| < 50 G) magnetic field in internetwork but Δ T = 7.2 ± 0.1 s for weak field in an area including network. The internetwork has no strong fields, but in network (|BZ| > 80 G) the mean delay time drops to Δ T = 3.4 ± 0.3 s. This is consistent with results by McIntosh, Fleck and Tarbell (2004) using TRACE 1600Å and 1700Å UV image series. Our principal result is that the time delay is greater in the internetwork than in the network by 1.4 ± 0.1 s, even for the same local magnetic field strength. This suggests that the difference must be an effect of the field topology. Spatial maps of time delays, in comparison to maps of such topological quantities as the height in the solar atmosphere at which the plasma β = 1, offer additional details of the relationship between wave propagation and the magnetic fields in the solar atmosphere. This work was supported in part by grants NSF-ATM 9987305 and NASA-NAG5-10880. The SVST is operated by the Swedish Royal Academy of Sciences at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Berger, T.E. and Title, A.M. 2001, ApJ, 553, 449. Cadavid, A.C., et al. 2003, ApJ, 586, 1409. Lawrence, J.K., et al. 2003, ApJ, 597, 1178. McIntosh, S.W., Fleck, B. and Tarbell, T.D. 2004, ApJ, 609, L95.

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