New Elliptical Flux Tube Model to Explain Sunspot Oscillations

A. Ali Aldhafeeri, V. Fedun, D. B. Jess, W. Brevis, G. Verth

Research output: Contribution to journalArticle

Abstract

This work is motivated by elliptical sunspot oscillation data that cannot be explained by the standard cylinder model. We obtained a new numerical solution of the dispersion relation for a compressible magnetic flux tube with an elliptical cross-section embedded in a magnetic environment. We applied the bisection method to solve this equation and investigated the behaviour of oscillations which arise under both photospheric and coronal conditions. From our solutions we obtain an approximation of a circle like shape which is in perfect agreement with a previous well known results. Our model also explains a mode detected in an elliptical sunspot using the ROSA (Rapid Oscillations in the Solar Atmosphere) instrument based at the Dunn Solar Telescope.
Original languageEnglish
JournalAmerican Geophysical Union, Fall Meeting 2019
Volume41
Publication statusPublished - 01 Dec 2019

Keywords

  • 7599 General or miscellaneous
  • SOLAR PHYSICS
  • ASTROPHYSICS
  • AND ASTRONOMY
  • 7899 General or miscellaneous
  • SPACE PLASMA PHYSICS
  • 7999 General or miscellaneous
  • SPACE WEATHER

Fingerprint Dive into the research topics of 'New Elliptical Flux Tube Model to Explain Sunspot Oscillations'. Together they form a unique fingerprint.

Cite this