The SWAP Filter: A Simple Azimuthally Varying Radial Filter for Wide-Field EUV Solar Images.

Authors :: Seaton DB
Berghmans D
Bloomfield DS
De Groof A
D'Huys E
Nicula B
Rachmeler LA
West MJ
Source :: Solar physics [Sol Phys] 2023; Vol. 298 (7), pp. 92. Date of Electronic Publication: 2023 Jul 18.
Publication Year :: 2023
Abstract: We present the SWAP Filter: an azimuthally varying, radial normalizing filter specifically developed for EUV images of the solar corona, named for the Sun Watcher with Active Pixels and Image Processing (SWAP) instrument on the Project for On-Board Autonomy 2 (PROBA2) spacecraft. We discuss the origins of our technique, its implementation and key user-configurable parameters, and highlight its effects on data via a series of examples. We discuss the filter's strengths in a data environment in which wide field-of-view observations that specifically target the low signal-to-noise middle corona are newly available and expected to grow in the coming years.<br />Supplementary Information: The online version contains supplementary material available at 10.1007/s11207-023-02183-w.<br />Competing Interests: Competing interestsThe authors declare no competing interests.<br /> (© The Author(s) 2023.)

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