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

Daniel B. Seaton; David Berghmans; Shaun Bloomfield; Anik De Groof; Elke D’Huys; Bogdan Nicula; Laurel A. Rachmeler; Matthew J. West

doi:10.1007/s11207-023-02183-w

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

Daniel B. Seaton^*, David Berghmans, Shaun Bloomfield, Anik De Groof, Elke D’Huys, Bogdan Nicula, Laurel A. Rachmeler, Matthew J. West

^*Corresponding author for this work

Mathematics, Physics and Electrical Engineering

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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.

Original language	English
Article number	92
Number of pages	17
Journal	Solar Physics
Volume	298
Issue number	7
DOIs	https://doi.org/10.1007/s11207-023-02183-w
Publication status	Published - 18 Jul 2023

Keywords

Corona
Instrumentation and data management
Image processing
Instrumental effects

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title = "The SWAP Filter: A Simple Azimuthally Varying Radial Filter for Wide-Field EUV Solar Images",

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{\textquoteright}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.",

keywords = "Corona, Instrumentation and data management, Image processing, Instrumental effects",

author = "Seaton, {Daniel B.} and David Berghmans and Shaun Bloomfield and {De Groof}, Anik and Elke D{\textquoteright}Huys and Bogdan Nicula and Rachmeler, {Laurel A.} and West, {Matthew J.}",

note = "Funding information: SWAP is a project of the Centre Spatial de Li{\`e}ge and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office (BELSPO). D.B. Seaton and M.J. West acknowledge support from NASA{\textquoteright}s Heliophysics Guest Investigator program, grant 80NSSC22K0523.",

year = "2023",

month = jul,

day = "18",

doi = "10.1007/s11207-023-02183-w",

language = "English",

volume = "298",

journal = "Solar Physics",

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TY - JOUR

T1 - The SWAP Filter

T2 - A Simple Azimuthally Varying Radial Filter for Wide-Field EUV Solar Images

AU - Seaton, Daniel B.

AU - Berghmans, David

AU - Bloomfield, Shaun

AU - De Groof, Anik

AU - D’Huys, Elke

AU - Nicula, Bogdan

AU - Rachmeler, Laurel A.

AU - West, Matthew J.

N1 - Funding information: SWAP is a project of the Centre Spatial de Liège and the Royal Observatory of Belgium funded by the Belgian Federal Science Policy Office (BELSPO). D.B. Seaton and M.J. West acknowledge support from NASA’s Heliophysics Guest Investigator program, grant 80NSSC22K0523.

PY - 2023/7/18

Y1 - 2023/7/18

N2 - 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.

AB - 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.

KW - Corona

KW - Instrumentation and data management

KW - Image processing

KW - Instrumental effects

UR - http://www.scopus.com/inward/record.url?scp=85165267482&partnerID=8YFLogxK

U2 - 10.1007/s11207-023-02183-w

DO - 10.1007/s11207-023-02183-w

M3 - Article

SN - 0038-0938

VL - 298

JO - Solar Physics

JF - Solar Physics

IS - 7

M1 - 92

ER -

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

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Keywords

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