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Temporal evolution of the Evershed flow in sunspots. I. Observational characterization of Evershed clouds by Solana, D. Cabrera; Rubio, L. R. Bellot; Beck, C.; Iniesta, J. C. del Toro is a scholarly article available to read on EtoBox.

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[Abridged] The magnetic and kinematic properties of the photospheric Evershed flow are relatively well known, but we are still far from a complete understanding of its nature. The evolution of the flow with time, which is mainly due to appearance of velocity packets called Evershed clouds (ECs), may provide information to further constrain its origin. Here we undertake a detailed analysis of the evolution of the Evershed flow by studying the properties of ECs. In this first paper we determine the sizes, proper motions, location in the penumbra, and frequency of appearance of ECs, as well as their typical Doppler velocities, linear and circular polarization signals, Stokes V area asymmetries, and continuum intensities. High-cadence, high-resolution, full vector spectropolarimetric measurements in visible and infrared lines are used to derive these parameters. We find that ECs appear in the mid penumbra and propage outward along filaments with large linear polarization signals and enhanced Evershed flows. The frequency of appearance of ECs varies between 15 and 40 minutes in different filaments. ECs exhibit the largest Doppler velocities and linear-to-circular polarization ratios of

Author

Solana, D. Cabrera; Rubio, L. R. Bellot; Beck, C.; Iniesta, J. C. del Toro

Published

2007

Language

EN