Magnetic Fields and Velocity Structures around a Cancellation Site

Details Magnetic Fields and Velocity Structures around a Cancellation Site Magnetic Fields and Velocity Structures around a Cancellation Site

2010-02-23

arxiv.org/abs/1002.4274v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

18 pages, 5 figures

Scientific paper

A cancellation is thought to be a basic process of the photospheric magnetic field and plays an important role in magnetic flux budget and in various solar activities. There are two major theoretical scenarios for this phenomena, i.e. the "U-loop emergence" and the Omega-loop submergence models. It is important to clarify which is the dominant process during the cancellation for the estimation of the solar magnetic flux transport through the surface. We study the vector magnetic field and velocity structures around a quiet Sun cancellation by using the Solar Optical Telescope on board Hinode satellite. Transverse magnetic field connecting the canceling magnetic features and strong long-lasting Doppler red-shift signal are found. The transverse field is observed in the first spectropolarimetric observation after the occurrence of the cancellation while the red-shift clearly delayed to the cancellation by 20 minutes. These results indicate that the observed cancellation is an Omega-loop submergence.

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