A distinct magnetic property of the inner penumbral boundary II. Formation of a penumbra at the expense of a pore

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00479157" target="_blank" >RIV/67985815:_____/17:00479157 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0275153" target="_blank" >http://hdl.handle.net/11104/0275153</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201628547" target="_blank" >10.1051/0004-6361/201628547</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A distinct magnetic property of the inner penumbral boundary II. Formation of a penumbra at the expense of a pore

Popis výsledku v původním jazyce

Here, we aim to study the development of a penumbra initiated at the boundary of a pore, where the penumbra colonises the entire pore ultimately. We have used Hinode/SOT G-band images to study the evolution of the penumbra. Hinode /SOT spectropolarimetric data were used to infer the magnetic field properties in the studied region. The penumbra forms at the boundary of a pore located close to the polarity inversion line of NOAA10960. As the penumbral bright grains protrude into the pore, the magnetic flux in the forming penumbra increases at the expense of the pore magnetic flux. Consequently, the pore disappears completely giving rise to an orphan penumbra. At all times, the vertical component of the magnetic field (B-ver) in the pore is smaller than B-ver found on stable umbra-penumbra boundaries (B-ver-stable), which is around 1.8 kG. Our findings are in an agreement with the need of B-ver-stable for establishing a stable umbra-penumbra boundary: while B-ver in the pore is smaller than B-ver-stable, the protrusion of penumbral grains into the pore area is not blocked, a stable pore-penumbra boundary does not establish, and the pore is fully overtaken by the penumbral magneto-convective mode. This scenario could also be one of the mechanisms giving rise to orphan penumbrae.

Název v anglickém jazyce

A distinct magnetic property of the inner penumbral boundary II. Formation of a penumbra at the expense of a pore

Popis výsledku anglicky

Here, we aim to study the development of a penumbra initiated at the boundary of a pore, where the penumbra colonises the entire pore ultimately. We have used Hinode/SOT G-band images to study the evolution of the penumbra. Hinode /SOT spectropolarimetric data were used to infer the magnetic field properties in the studied region. The penumbra forms at the boundary of a pore located close to the polarity inversion line of NOAA10960. As the penumbral bright grains protrude into the pore, the magnetic flux in the forming penumbra increases at the expense of the pore magnetic flux. Consequently, the pore disappears completely giving rise to an orphan penumbra. At all times, the vertical component of the magnetic field (B-ver) in the pore is smaller than B-ver found on stable umbra-penumbra boundaries (B-ver-stable), which is around 1.8 kG. Our findings are in an agreement with the need of B-ver-stable for establishing a stable umbra-penumbra boundary: while B-ver in the pore is smaller than B-ver-stable, the protrusion of penumbral grains into the pore area is not blocked, a stable pore-penumbra boundary does not establish, and the pore is fully overtaken by the penumbral magneto-convective mode. This scenario could also be one of the mechanisms giving rise to orphan penumbrae.

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/GA14-04338S" target="_blank" >GA14-04338S: Fyzikální podstata slunečních skvrn</a><br>

Návaznosti

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

Rok uplatnění

2017

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

597

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

4

Strana od-do

"A60/1"-"A60/4"

Kód UT WoS článku

000392392900037

EID výsledku v databázi Scopus

2-s2.0-85007524220