7-11 July 2014
Africa/Johannesburg timezone
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Investigating the chromosphere above sunspot umbrae with an acoustic resonator

Presented by Dr. Gert BOTHA on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track D2 - Space Science
Board #: D2.375

Abstract

Above a sunspot umbra the chromosphere resonates with three-minute oscillations. These oscillations can be explained as an acoustic resonator with slow magnetosonic waves moving along magnetic field lines and are partially reflected at the solar photosphere and transition region. The temperature structure of the chromosphere is explored by perturbing the plasma with random noise. Spectra of the velocity fluctuations show that as the chromospheric depth increases, the gradient of the power in the spectra decreases. This relation is explored with white, pink and brown noise seeds as well as different temperature profile configurations. It was found that a clear signature in the obtained spectra can be used as a potential measure for the chromospheric depth above sunspots.

Award

No

Level

PhD

Supervisor

Gert Botha (gert.botha@northumbria.ac.uk) University of Northumbria at Newcastle Upon Tyne, UK

Paper

No

Place

Room: D Ring ground level


Primary authors

  • Mr. Ben SNOW Univesity of Northumbria at Newcastle Upon Tyne, UK
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Co-authors

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