7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

Investigating the chromosphere above sunspot umbrae with an acoustic resonator

8 Jul 2014, 17:10
1h 50m
D Ring ground level

D Ring ground level

Board: D2.375
Poster Presentation Track D2 - Space Science Poster1

Speaker

Dr Gert Botha (University of Northumbria at Newcastle Upon Tyne, UK)

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Main supervisor (name and email)<br>and his / her institution

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

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

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.

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Primary author

Mr Ben Snow (Univesity of Northumbria at Newcastle Upon Tyne, UK)

Co-author

Dr Gert Botha (University of Northumbria at Newcastle Upon Tyne, UK)

Presentation Materials

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