Dramatic variations in electron temperature at European mid-latitudes caused by the severe storm of September 7-8, 2017: observations by Kharkiv IS radar and comparison with FLIP and IRI/TBT-2012 models

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F18%3A00491785" target="_blank" >RIV/68378289:_____/18:00491785 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Dramatic variations in electron temperature at European mid-latitudes caused by the severe storm of September 7-8, 2017: observations by Kharkiv IS radar and comparison with FLIP and IRI/TBT-2012 models

Popis výsledku v původním jazyce

The enhanced geomagnetic activity of September 7-8 led to strong positive and negative ionospheric storms. ThenKharkiv incoherent scatter radar (49.6 N, 36.3 E) observed significant deviations of the electron temperature (Te)nfrom its quiet-time values. First, there was a sharp decrease of Te from ∼3000 K to ∼2000 K at the altitude of 500nkm observed on the morning of September 7. This decrease is attributed to increased local electron-ion coolingndue to a 100% enhancement in electron density. Second, there was a dramatic 4000 K (a factor of ∼5) increase inntopside electron temperature before sunrise on September 8. This temperature increase was most likely caused by anheat flux from enhanced ring current heating. The field line interhemispheric plasma model (FLIP) has been used toninvestigate these observed phenomena. A comparison with the IRI climatological model (TBT-2012, recommendednoption for the topside electron temperature from IRI-2012) and with available satellite data (e.g. Swarm A, B, C)nis also presented.

Název v anglickém jazyce

Dramatic variations in electron temperature at European mid-latitudes caused by the severe storm of September 7-8, 2017: observations by Kharkiv IS radar and comparison with FLIP and IRI/TBT-2012 models

Popis výsledku anglicky

The enhanced geomagnetic activity of September 7-8 led to strong positive and negative ionospheric storms. ThenKharkiv incoherent scatter radar (49.6 N, 36.3 E) observed significant deviations of the electron temperature (Te)nfrom its quiet-time values. First, there was a sharp decrease of Te from ∼3000 K to ∼2000 K at the altitude of 500nkm observed on the morning of September 7. This decrease is attributed to increased local electron-ion coolingndue to a 100% enhancement in electron density. Second, there was a dramatic 4000 K (a factor of ∼5) increase inntopside electron temperature before sunrise on September 8. This temperature increase was most likely caused by anheat flux from enhanced ring current heating. The field line interhemispheric plasma model (FLIP) has been used toninvestigate these observed phenomena. A comparison with the IRI climatological model (TBT-2012, recommendednoption for the topside electron temperature from IRI-2012) and with available satellite data (e.g. Swarm A, B, C)nis also presented.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

<a href="/cs/project/LTAUSA17100" target="_blank" >LTAUSA17100: Modely parametrů termálního plazmatu v okolí Země a jejich specifikace v reálném čase na základě družicových měření</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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