Publication detail

A Novel Technique for the Extraction of Dynamic Events in Extreme Ultraviolet Solar Images

KALENSKÁ, P. RAJMIC, P. GEBRTOVÁ, K. DRUCKMÜLLER, M.

Original Title

A Novel Technique for the Extraction of Dynamic Events in Extreme Ultraviolet Solar Images

Type

journal article in Web of Science

Language

English

Original Abstract

High-spatial-resolution images of the solar corona acquired in the extreme ultraviolet (EUV), most notably with the Atmospheric Imaging Assembly (AIA) instrument on the Solar Dynamics Observatory (SDO) reveal the abundance of dynamic events which range from flaring bright points and jets to erupting prominences and coronal mass ejections (CMEs). In this work we present novel techniques to extract such dynamic events from the more steady background corona using 17.1 nm SDO-AIA images. The techniques presented here treat any time series of coronal images as a matrix that can be decomposed into two matrices representing the background and the dynamic component, respectively. The latter has the properties of a so-called sparse matrix, and the proposed methods are classified as methods based on sparse representations. The proposed methods are the median-filter method, the principal component pursuit, and the dynamic-mode decomposition, all of which include data pre-processing using the noise-adaptive fuzzy equalization method. The study reveals that the median-filter method and the dynamic-mode decomposition enhance all motions in the time series and produce similar results. On the other hand, the principal component pursuit enables the clear differentiation of CMEs from the background corona, thus providing a valuable tool for the characterization of their acceleration profiles in the low corona as seen in the EUV.

Keywords

Solar coronal mass ejections; Solar corona; Analytical mathematics; Astronomy software; Computational methods

Authors

KALENSKÁ, P.; RAJMIC, P.; GEBRTOVÁ, K.; DRUCKMÜLLER, M.

Released

7. 11. 2024

Publisher

The American Astronomical Society

ISBN

1538-4365

Periodical

Astrophysical Journal, Supplement Series

Year of study

275

Number

1

State

United States of America

Pages count

10

URL

https://iopscience.iop.org/article/10.3847/1538-4365/ad8633

BibTex

@article{BUT191132,
  author="Petra {Kalenská} and Pavel {Rajmic} and Karolína {Gebrtová} and Miloslav {Druckmüller}",
  title="A Novel Technique for the Extraction of Dynamic Events in Extreme Ultraviolet Solar Images",
  journal="Astrophysical Journal, Supplement Series",
  year="2024",
  volume="275",
  number="1",
  pages="10",
  doi="10.3847/1538-4365/ad8633",
  issn="1538-4365",
  url="https://iopscience.iop.org/article/10.3847/1538-4365/ad8633"
}