Solar and stellar quakes: 3 March 6:30pm (via Zoom)
Presented by Dr Alina Donea, Monash University
When the Sun unleashes a huge burst of electromagnetic radiation in the form of a solar flare, the flare sometimes generates seismic waves in the Sun’s interior and on its surface, in the photosphere, called a sunquake. Sunquakes are mostly detected as ripples on the Sun’s surface. There’s still much we don’t know about sunquakes. Why are only some solar flares accompanied by sunquakes while others are seismically quiet? Analogous to solar flares, flare phenomena on other stars (namely stellar flares) have also been noticed by astronomers through inspection of stellar light curves and spectra in various bands. Would stars produce stellar quakes?
Bio:
Dr Alina Donea is a Senior Lecturer in Astrophysics and Applied Mathematics at Monash University and a PhD supervisor in Solar Physics. She is a coordinator of a Machine Learning Data Application Group in Solar Physics (BSc and Diploma Physics Bucharest University, PhD Mathematics and Astronomy Romanian Academy and Max Planck, Graduate Certificate High Education Monash). Alina teaches Mathematical Modelling and Advanced Engineering Mathematics, as well as Astrophysics and Visualisation in Mathematics in the School of Mathematics.
Dr Donea is also a member of the Astronomical Society of Victoria.
Dr Donea's research field is focused on helioseismology, wave mechanics, acoustics of solar spots, magnetic fields, solar quakes and solar flares. An expert in Helioseismic Holography (a mathematical method which can tell you how loud is the Sun), Alina can detect solar quakes in satellite images from state-of-art instruments. Her recent interest is in modelling magnetic polarity distributions of solar activity from its helioseismic signatures and applying deep learning AI algorithms in the field of machine learning for solar imaging and space weather forcasting. Dr Donea was Partner-Investigator in a major NASA research proposal ”Exploring the Physical Relationship Among Photospheric Magnetic Field Changes, Sunspot Motions, and Sunquakes During Solar Eruptions” and a expert NASA reviewer for the Solar and Heliospheric Physics Supporting Research and Technology Programs and is the author of over 60 refereed publications.
Details: This presentation will be on-line by Zoom. Members will be emailed the Zoom link. If you are not a member and want to attend this talk please email our secretary on: sydneycityskywatchers@gmail.com.
Please log-in by 6:25pm. Notices and a short presentation by members are delivered before or after the keynote depending on circumstances.
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