Large-Scale Dune Aurora Event Investigation Combining Citizen Scientists' Photographs and Spacecraft Observations

Show full item record



Permalink

http://hdl.handle.net/10138/332747

Citation

Grandin, M, Palmroth, M, Whipps, G, Kalliokoski, M, Ferrier, M, Paxton, L J, Mlynczak, M G, Hilska, J, Holmseth, K, Vinorum, K & Whenman, B 2021, ' Large-Scale Dune Aurora Event Investigation Combining Citizen Scientists' Photographs and Spacecraft Observations ', AGU Advances, vol. 2, no. 2, ARTN e2020AV000338 . https://doi.org/10.1029/2020AV000338

Title: Large-Scale Dune Aurora Event Investigation Combining Citizen Scientists' Photographs and Spacecraft Observations
Author: Grandin, Maxime; Palmroth, Minna; Whipps, Graeme; Kalliokoski, Milla; Ferrier, Mark; Paxton, Larry J.; Mlynczak, Martin G.; Hilska, Jukka; Holmseth, Knut; Vinorum, Kjetil; Whenman, Barry
Contributor organization: Particle Physics and Astrophysics
Space Physics Research Group
Department of Physics
Doctoral Programme in Particle Physics and Universe Sciences
Date: 2021-06
Language: eng
Number of pages: 19
Belongs to series: AGU Advances
ISSN: 2576-604X
DOI: https://doi.org/10.1029/2020AV000338
URI: http://hdl.handle.net/10138/332747
Abstract: Recently, citizen scientist photographs led to the discovery of a new auroral form called "the dune aurora" which exhibits parallel stripes of brighter emission in the green diffuse aurora at about 100 km altitude. This discovery raised several questions, such as (i) whether the dunes are associated with particle precipitation, (ii) whether their structure arises from spatial inhomogeneities in the precipitating fluxes or in the underlying neutral atmosphere, and (iii) whether they are the auroral manifestation of an atmospheric wave called a mesospheric bore. This study investigates a large-scale dune aurora event on 20 January 2016 above Northern Europe. The dunes were observed from Finland to Scotland, spanning over 1,500 km for at least 4 h. Spacecraft observations indicate that the dunes are associated with particle precipitation and reveal the presence of a temperature inversion layer below the mesopause during the event, creating suitable conditions for mesospheric bore formation. The analysis of a time lapse of pictures by a citizen scientist from Scotland leads to the estimate that, during this event, the dunes propagate toward the west-southwest direction at about 200 m s(-1), presumably indicating strong horizontal winds near the mesopause. These results show that citizen science and dune aurora studies can fill observational gaps and be powerful tools to investigate the least-known region of near-Earth space at altitudes near 100 km.
Subject: 114 Physical sciences
citizen science
dune aurora
ionosphere-atmosphere interactions
mesospheric bore
MESOSPHERIC TEMPERATURE INVERSION
INCIDENT ELECTRON-SPECTRA
CORONAL MASS EJECTIONS
SOLAR-WIND
DEDUCING COMPOSITION
OPTICAL MEASUREMENTS
MAGNETIC-FIELD
BORE
LAYERS
STEVE
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
2020AV000338.pdf 3.081Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record