Oxygen line in fireball spectra and implications to satellite observations of fireballs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F23%3A00604851" target="_blank" >RIV/67985815:_____/23:00604851 - isvavai.cz</a>

Výsledek na webu

<a href="https://articles.adsabs.harvard.edu/pdf/2023pimo.conf...44V" target="_blank" >https://articles.adsabs.harvard.edu/pdf/2023pimo.conf...44V</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Oxygen line in fireball spectra and implications to satellite observations of fireballs

Popis výsledku v původním jazyce

We examined the spectral region at 777 nm, where the oxygen triplet dominates, in spectra of 43 fireballs with magnitudes from -8 to -15 obtained within the European Fireball Network. The radiant intensity was compared with the energy radiated in the broadband spectrum. It was confirmed that meteor velocity strongly affects the intensity of the oxygen triplet. In slow meteors, the excitation of atmospheric elements, including oxygen, is low and the relative brightness of atmospheric lines is lower than it is in the case of fast meteors. On the other hand, the oxygen triplet belongs to the brightest lines in the spectra of fast meteors. This behavior must be taken into account when estimating total fireball magnitude from narrow band observations at 777 nm, as is the case with the Geostationary Lightning Mapper (GLM) on board the GOES satellites. We derived an empirical relation between meteor speed, radiation at 777 nm, and the absolute visual magnitude of the meteor. We have successfully applied this relation to real GLM data and can estimate the magnitude of the fireballs observed from these weather satellites.

Název v anglickém jazyce

Oxygen line in fireball spectra and implications to satellite observations of fireballs

Popis výsledku anglicky

We examined the spectral region at 777 nm, where the oxygen triplet dominates, in spectra of 43 fireballs with magnitudes from -8 to -15 obtained within the European Fireball Network. The radiant intensity was compared with the energy radiated in the broadband spectrum. It was confirmed that meteor velocity strongly affects the intensity of the oxygen triplet. In slow meteors, the excitation of atmospheric elements, including oxygen, is low and the relative brightness of atmospheric lines is lower than it is in the case of fast meteors. On the other hand, the oxygen triplet belongs to the brightest lines in the spectra of fast meteors. This behavior must be taken into account when estimating total fireball magnitude from narrow band observations at 777 nm, as is the case with the Geostationary Lightning Mapper (GLM) on board the GOES satellites. We derived an empirical relation between meteor speed, radiation at 777 nm, and the absolute visual magnitude of the meteor. We have successfully applied this relation to real GLM data and can estimate the magnitude of the fireballs observed from these weather satellites.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GX19-26232X" target="_blank" >GX19-26232X: Mapování zdrojů meteoroidů z hlediska jejich složení a výskytu ve sluneční soustavě</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the International Meteor Conference

ISBN

978-2-87355-035-6

ISSN

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e-ISSN

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Počet stran výsledku

3

Strana od-do

38-40

Název nakladatele

International Meteor Organization

Místo vydání

Mechelen

Místo konání akce

Poroszlo

Datum konání akce

29. 9. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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