HR: 1340h
AN: SH13A-1141    [Abstracts]
TI: Temporal Variations in the Evershed Flow
AU: * Balasubramaniam, K S
EM: bala@nso.edu
AF: National Solar Observatory, Sacramento Peak, Sunspot, NM 88349 United States
AU: Pevtsov, A A
EM: apevtsov@nso.edu
AF: National Solar Observatory, Sacramento Peak, Sunspot, NM 88349 United States
AU: Olmschenk, S
AF: University of Chicago., Presently at University of Michigan, Ann Arbor, Ann Arbor, MI 48109 United States
AB: We present results of an analysis of the temporal Doppler variations of the Evershed flow. Doppler shifts were calculated from a unique, high-resolution data set of 39 spectral lines, spanning the photosphere and chromosphere. Our results indicate a quasi-periodic structure of the Evershed flow with a typical period between 18-24 minutes in the photosphere and 12-18 minutes in the chromosphere. We discuss the implications of these results for both the siphon flow and the moving flux tube models.
DE: 7500 SOLAR PHYSICS, ASTROPHYSICS, AND ASTRONOMY
DE: 7507 Chromosphere
DE: 7524 Magnetic fields
DE: 7529 Photosphere
DE: 7536 Solar activity cycle (2162)
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2004 AGU Fall Meeting