August 26 Fri 14:30～16:00 Solar and Space Plasma Seminar Zoom
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8月26日（火）
Campus： Mitaka
Seminar： Solar and Space Plasma Seminar
Regularly Scheduled/Sporadic： Scheduled
Date and time：26th Aug (Fri), 14:30-16:00
Place： Zoom
Speaker：Castellanos Duran, Juan Sebastian
Affiliation：Max Planck Institute for Solar System Research
Title：Revealing extreme fields and flows in sunspots with Hinode/SP
Sunspots are the most prominent features observed on the solar surface. They are governed by the magnetic topology and gas flows. On the one hand, the strongest magnetic fields measured in sunspots typically reach values of a few kiloGauss in sunspot umbrae. On the other hand, plasma flows, known as Evershed flow, are ubiquitously observed to run radially outwards along penumbral filaments. However, recent observations have shown that these fields and flows are not the entire story. The first part of this talk aims to present observational advances in measurements of superstrong magnetic fields, several times larger than the usual umbral fields using spectropolarimetric data taken from space by the Japanese Hinode spacecraft. The second part reviews new observational evidence about the so-called counter Evershed flows (CEFs). These flows run toward the umbra, in a contrary direction to the (normal) Evershed flow. I will explore their characteristics and dynamics, and show how common these features appear in sunspots groups.
Facilitator
-Name：Takayoshi oba
Comment：in English