UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2025-08-20 22:57
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Conference: Bucharest University Faculty of Physics 2025 Meeting


Section: Atomic and Molecular Physics. Astrophysics. Applications. Optics, Spectroscopy, Plasma and Lasers


Title:
A Study of Filament Eruptions


Authors:
Alexandra CHIRITESCU (1, 2), Diana BESLIU-IONESCU (2)


Affiliation:
1) University of Bucharest, Bucharest, Romania

2) Astronomical Institute of the Romanian Academy, Bucharest, Romania


E-mail
alexandra.chiritescu@s.unibuc.ro, diana.ionescu@astro.ro


Keywords:
Filament eruption kinematics; Solar Orbiter; Solar Dynamics Observatory


Abstract:
Solar filaments are long, thread-like structures of cooler, denser plasma suspended in the Sun’s atmosphere by magnetic fields. When they erupt, they can release large amounts of energy and solar material into space, sometimes affecting space weather near Earth. In this work, the study of five filament eruptions selected from a larger sample of 68 analyzed events from the Royal Observatory of Belgium / Solar Influences Data Analysis Center (2020) catalogue will be presented. All eruptions occurred during the current ascending phase of Solar Cycle 25 and were observed using extreme ultraviolet data from the Full Sun Imager (FSI) onboard the Solar Orbiter (SOLO) at 174 Å and 304 Å, and from the 304 Å channel of the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO). To better track the motion of each eruption, a technique called running difference imaging was used in JHelioviewer, which highlights changes between frames by subtracting one image from the previous. This made it easier to follow the evolving wavefront of each eruption along a defined direction. Projected distances were measured and corresponding velocities and accelerations were calculated. All five eruptions show a characteristic two-phase behavior: an initial slow rise, followed by a fast rise. These results align with expected kinematic patterns.


References:

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A. C. Sterling and R. L. Moore. Slow-rise and fast-rise phases of an erupting solar filament, and flare emission onset. The Astrophysical Journal, 630(2): 1148, 2005.



P. Zou, C. Jiang, F. Wei, P. Zuo, and Y. Wang. A Statistical Study of Solar Filament Eruptions that Form High-speed Coronal Mass Ejections. Astrophysical Journal, 884(2): 157, 2019.

Acknowledgement:
This work was carried out during an internship at the Astronomical Institute of the Romanian Academy. We acknowledge the use of observational data from the Solar Orbiter mission (ESA/NASA) and the Solar Dynamics Observatory (NASA), accessed via JHelioviewer. The filament eruption catalogue was provided by the Solar Influences Data Analysis Center (SIDC), Royal Observatory of Belgium.