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Author: Vierinen, Juha × DDC: 620 × Type: Text × Type: article × search.filters.applied.f.series: Frontiers in astronomy and space sciences 9 (2022) ×

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    The future of auroral E-region plasma turbulence research
    (Lausanne : Frontiers Media, 2022) Huyghebaert, Devin; Billett, Daniel; Chartier, Alex; Chau, Jorge L.; Hussey, Glenn C.; Hysell, David L.; Ivarsen, Magnus F.; Mesquita, Rafael L. A.; Rojas, Enrique; Vierinen, Juha; Young, Matthew
    The heating caused by ionospheric E-region plasma turbulence has documented global implications for the energy transfer from space into the terrestrial atmosphere. Traveling atmospheric disturbances, neutral wind motion, energy deposition rates, and ionospheric conductance have all been shown to be potentially affected by turbulent plasma heating. Therefore it is proposed to enhance and expand existing ionospheric radar capabilities and fund research into E-region plasma turbulence so that it is possible to more accurately quantify the solar-terrestrial energy budget and study phenomena related to E-region plasma turbulence. The proposed research funding includes the development of models to accurately predict and model the E-region plasma turbulence using particle-in-cell analysis, fluid-based analysis, and hybrid combinations of the two. This review provides an expanded and more detailed description of the past, present, and future of auroral E-region plasma turbulence research compared to the summary report submitted to the National Academy of Sciences Decadal Survey for Solar and Space Physics (Heliophysics) 2024–2033 (Huyghebaert et al., 2022a).
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    Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications
    (Lausanne : Frontiers Media, 2022) Vierinen, Juha; Aslaksen, Torstein; Chau, Jorge Luis; Gritsevich, Maria; Gustavsson, Björn; Kastinen, Daniel; Kero, Johan; Kozlovsky, Alexandre; Kværna, Tormod; Midtskogen, Steinar; Näsholm, Sven Peter; Ulich, Thomas; Vegum, Ketil; Lester, Mark
    Meteor observations provide information about Solar System constituents and their influx onto Earth, their interaction processes in the atmosphere, as well as the neutral dynamics of the upper atmosphere. This study presents optical, radar, and infrasound measurements of a daytime fireball that occurred on 4 December 2020 at 13:30 UTC over Northeast Sweden. The fireball was recorded with two video cameras, allowing a trajectory determination to be made. The orbital parameters are compatible with the Northern Taurid meteor shower. The dynamic mass estimate based on the optical trajectory was found to be 0.6–1.7 kg, but this estimate can greatly vary from the true entry mass significantly due to the assumptions made. The meteor trail plasma was observed with an ionosonde as a sporadic E-like ionogram trace that lasted for 30 min. Infrasound emissions were detected at two sites, having propagation times consistent with a source location at an altitude of 80–90 km. Two VHF specular meteor radars observed a 6 minute long non-specular range spread trail echo as well as a faint head echo. Combined interferometric range-Doppler analysis of the meteor trail echoes at the two radars, allowed estimation of the mesospheric horizontal wind altitude profile, as well as tracking of the gradual deformation of the trail over time due to a prevailing neutral wind shear. This combined analysis indicates that the radar measurements of long-lived non-specular range-spread meteor trails produced by larger meteoroids can be used to measure the meteor radiant by observing the line traveled by the meteor. Furthermore, a multistatic meteor radar observation of these types of events can be used to estimate mesospheric neutral wind altitude profiles.
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    Corrigendum: Multi-instrument observations of the Pajala fireball: Origin, characteristics, and atmospheric implications
    (Lausanne : Frontiers Media, 2022) Vierinen, Juha; Aslaksen, Torstein; Chau, Jorge Luis; Gritsevich, Maria; Gustavsson, Björn; Kastinen, Daniel; Kero, Johan; Kozlovsky, Alexandre; Kværna, Tormod; Midtskogen, Steinar; Näsholm, Sven Peter; Ulich, Thomas; Vegum, Ketil; Lester, Mark
    In the original article, the name of author “Steinar Midskogen” was misspelled. The correct spelling appears above. The authors apologize for this error and state that this does not change the scientific conclusions of the article in any way. The original article has been updated.