High-resolution spectroscopy of a surge in an emerging flux region

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00537138" target="_blank" >RIV/67985815:_____/20:00537138 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/0004-6361/201936762" target="_blank" >https://doi.org/10.1051/0004-6361/201936762</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201936762" target="_blank" >10.1051/0004-6361/201936762</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High-resolution spectroscopy of a surge in an emerging flux region

Popis výsledku v původním jazyce

The active region started as a bipolar region with continuous flux emergence when a new flux system emerged in the leading part during the VTT observations, resulting in two homologous surges. While flux cancellation at the base of the surges provided the energy for ejecting the cool plasma, strong proper motions of the leading pores changed the magnetic field topology making the region susceptible to surging. Despite the surge activity in the leading part, an arch filament system in the trailing part of the old flux remained stable. Thus, stable and violently expelled mass-loaded ascending magnetic structures can coexist in close proximity. Investigating the height dependence of LOS velocities revealed the existence of neighboring strong up- and downflows. However, downflows occur with a time lag. The opacity of the ejected cool plasma decreases with distance from the base of the surge, while the speed of the ejecta increases. The location at which the surge becomes invisible in H alpha corresponds to the interface where the surge brightens in HeII lambda 304 angstrom. Broad-shouldered and dual-lobed H alpha profiles suggests accelerated or decelerated and highly structured LOS plasma flows. Significantly broadened H alpha profiles imply significant heating at the base of the surges, which is also supported by bright kernels in UV and EUV images uncovered by swaying motions of dark fibrils at the base of the surges.Conclusions. The interaction of newly emerging flux with pre-existing flux concentrations of a young, diffuse active region provided suitable conditions for two homologous surges. High-resolution spectroscopy revealed broadened and dual-lobed H alpha profiles tracing accelerated or decelerated flows of cool plasma along the multi-threaded structure of the surge.

Název v anglickém jazyce

High-resolution spectroscopy of a surge in an emerging flux region

Popis výsledku anglicky

The active region started as a bipolar region with continuous flux emergence when a new flux system emerged in the leading part during the VTT observations, resulting in two homologous surges. While flux cancellation at the base of the surges provided the energy for ejecting the cool plasma, strong proper motions of the leading pores changed the magnetic field topology making the region susceptible to surging. Despite the surge activity in the leading part, an arch filament system in the trailing part of the old flux remained stable. Thus, stable and violently expelled mass-loaded ascending magnetic structures can coexist in close proximity. Investigating the height dependence of LOS velocities revealed the existence of neighboring strong up- and downflows. However, downflows occur with a time lag. The opacity of the ejected cool plasma decreases with distance from the base of the surge, while the speed of the ejecta increases. The location at which the surge becomes invisible in H alpha corresponds to the interface where the surge brightens in HeII lambda 304 angstrom. Broad-shouldered and dual-lobed H alpha profiles suggests accelerated or decelerated and highly structured LOS plasma flows. Significantly broadened H alpha profiles imply significant heating at the base of the surges, which is also supported by bright kernels in UV and EUV images uncovered by swaying motions of dark fibrils at the base of the surges.Conclusions. The interaction of newly emerging flux with pre-existing flux concentrations of a young, diffuse active region provided suitable conditions for two homologous surges. High-resolution spectroscopy revealed broadened and dual-lobed H alpha profiles tracing accelerated or decelerated flows of cool plasma along the multi-threaded structure of the surge.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GC18-08097J" target="_blank" >GC18-08097J: Magnetické pole klidného Slunce a vynořující se magnetické oblasti - dynamika, energetika a odezva horní atmosféry</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

639

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

12

Strana od-do

A19

Kód UT WoS článku

000549972400008

EID výsledku v databázi Scopus

2-s2.0-85087898280