Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

 

sinds 05 februari 2011 :
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Ananya Rawat & Girjesh Gupta

Exploring Magnetic Coupling of Solar Atmosphere Through Frequency Modulations of 3-min Slow Magnetoacoustic Waves

(Volume 93 - Année 2024 — No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation)
DOI: 10.25518/0037-9565.11933
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Abstract

Coronal fan loops rooted in sunspot umbra show outward propagating waves with subsonic phase speed and a period around 3 min. However, their source region in the lower atmosphere is still ambiguous. We performed multi-wavelength observations of a clean fan loop system rooted in a sunspot utilizing data from the Interface Region Imaging Spectrograph (IRIS) and the Solar Dynamics Observatory (SDO). We explored the less studied property of frequency modulation of these 3-min waves from the photosphere to the corona, and identified periodicities in the ranges of 14-20 min, and 24-35 min. Based on our findings, we interpret that the 3-min slow waves observed in the coronal fan loops are driven by 3-min oscillations observed at the photospheric footpoints of these fan loops in the umbral region. We also investigated possible connections between the 3-min and 5-min oscillations observed at the photosphere, which are still poorly understood. Our results provide clear evidence of magnetic coupling of the solar umbral atmosphere through the propagation of 3-min waves along the fan loops at different atmospheric heights.

Keywords : Sun: corona, Sun: chromosphere, Sun: photosphere, sunspot, waves

Om dit artikel te citeren:

Ananya Rawat & Girjesh Gupta, «Exploring Magnetic Coupling of Solar Atmosphere Through Frequency Modulations of 3-min Slow Magnetoacoustic Waves», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 948-961 URL : http://popups.ulg.be/0037-9565/index.php?id=11933.

Over : Ananya Rawat

Udaipur Solar Observatory, Physical Research Laboratory, Udaipur, India 313001 and Department of Physics, Indian Institute of Technology Gandhinagar, India 382355. Corresponding author: ananyarawat@prl.res.in

Over : Girjesh Gupta

Udaipur Solar Observatory, Physical Research Laboratory, Udaipur, India 313001. Corresponding author: girjesh@prl.res.in