Preprints
https://doi.org/10.22541/essoar.172641540.02035523/v1
https://doi.org/10.22541/essoar.172641540.02035523/v1
21 Oct 2024
 | 21 Oct 2024
Status: this preprint is open for discussion.

No statistical link between proton aurora and Pc1 pulsations in the high-latitude dayside using ground-based measurements

Rowan Dayton-Oxland, Daniel K. Whiter, Hyomin Kim, and Betty Lanchester

Abstract. In order to test the hypothesis that EMIC waves are responsible for the acceleration of auroral protons, we have used spectrograph measurements of proton aurora over Svalbard alongside co-located magnetometer measurements of Pc1 pulsations. No evidence of a link between proton aurora and Pc1 waves was found by three different methods. Firstly, accelerated protons and Pc1 pulsations have no coincident occurrence. Secondly, the proton energy spectrum does not change between Pc1 activity and quiet times. Finally, no imprint of the EMIC wave is found in periodicity of the intensity and blue-shift of the proton H-α line, unlike in flickering electron aurora where intensity fluctuations are caused by EMIC waves. We find no evidence that EMIC waves are the mechanism responsible for accelerating auroral protons in the high-latitude dayside, at least based on the considered ground-based data of proton aurora and magnetic Pc1 pulsations.

Rowan Dayton-Oxland, Daniel K. Whiter, Hyomin Kim, and Betty Lanchester

Status: open (until 08 Dec 2024)

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Rowan Dayton-Oxland, Daniel K. Whiter, Hyomin Kim, and Betty Lanchester
Rowan Dayton-Oxland, Daniel K. Whiter, Hyomin Kim, and Betty Lanchester

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Short summary
It is typically thought that the protons which precipitate down from space to cause proton aurora are accelerated by a type of plasma wave called an EMIC wave. In this study we use ground-based observations of proton aurora and Pc1 waves (the ground signature of EMIC waves) to test whether this mechanism occurs in the high Arctic over Svalbard, on the Earth's day side. We did not find any link between the proton aurora and Pc1 pulsations, contrary to our expectations.