Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F18%3A00486122" target="_blank" >RIV/68378289:_____/18:00486122 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5194/angeo-36-71-2018" target="_blank" >http://dx.doi.org/10.5194/angeo-36-71-2018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5194/angeo-36-71-2018" target="_blank" >10.5194/angeo-36-71-2018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015

Popis výsledku v původním jazyce

Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhancement (LTE) in the form of two separated plumes, which peaked southward of South Africa. The plumes were first observed at 05:00UT near the southwestern coast of Australia. The southern plume was associated with local time slightly after noontime (1- 2h after local noon). The plumes moved with the Sun. They peaked near 13:00 UT southward of South Africa. The southern plume kept constant geomagnetic latitude (63-64oS), it persisted for about 10h, whereas the northern plume persisted for about 2h more. Both plumes disappeared over the South Atlantic Ocean. No similar LTE event was observed during the prolonged solar activity minimum period of 2006-2009. In 2012-2016 we detected altogether 26 LTEs and all of them were associated with the southward excursion of Bz. The negative Bz excursion is a necessary but not sufficient condition for the LTE occurrence as during some geomagnetic storms associated with negative Bz excursions the LTE events did not appear.

Název v anglickém jazyce

Unexpected Southern Hemisphere ionospheric response to geomagnetic storm of 15 August 2015

Popis výsledku anglicky

Geomagnetic storms are the most pronounced phenomenon of space weather. When studying ionospheric response to a storm of 15 August 2015, an unexpected phenomenon was observed at higher middle latitudes of the Southern Hemisphere. This phenomenon was a localized total electron content (TEC) enhancement (LTE) in the form of two separated plumes, which peaked southward of South Africa. The plumes were first observed at 05:00UT near the southwestern coast of Australia. The southern plume was associated with local time slightly after noontime (1- 2h after local noon). The plumes moved with the Sun. They peaked near 13:00 UT southward of South Africa. The southern plume kept constant geomagnetic latitude (63-64oS), it persisted for about 10h, whereas the northern plume persisted for about 2h more. Both plumes disappeared over the South Atlantic Ocean. No similar LTE event was observed during the prolonged solar activity minimum period of 2006-2009. In 2012-2016 we detected altogether 26 LTEs and all of them were associated with the southward excursion of Bz. The negative Bz excursion is a necessary but not sufficient condition for the LTE occurrence as during some geomagnetic storms associated with negative Bz excursions the LTE events did not appear.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10509 - Meteorology and atmospheric sciences

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Annales Geophysicae

ISSN

0992-7689

e-ISSN

—

Svazek periodika

36

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

9

Strana od-do

71-79

Kód UT WoS článku

000423022100001

EID výsledku v databázi Scopus

2-s2.0-85040924059