Matches in SemOpenAlex for { <https://semopenalex.org/work/W2896429192> ?p ?o ?g. }
Showing items 1 to 90 of
90
with 100 items per page.
- W2896429192 abstract "Context. In a recent statistical study of sunspots in 79 active regions, the vertical magnetic field component $B_text{ver}$ averaged along the umbral boundary is found to be independent of sunspot size. The authors of that study conclude that the absolute value of $B_text{ver}$ at the umbral boundary is the same for all spots. Aims. We investigate the temporal evolution of $B_text{ver}$ averaged along the umbral boundary of one long-lived sunspot during its stable phase. Methods. We analysed data from the HMI instrument on-board SDO. Contours of continuum intensity at $I_text{c}=0.5I_text{qs}$, whereby $I_text{qs}$ refers to the average over the quiet sun areas, are used to extract the magnetic field along the umbral boundary. Projection effects due to different formation heights of the Fe I 617.3 nm line and continuum are taken into account. To avoid limb artefacts, the spot is only analysed for heliocentric angles smaller than $60^{circ}$. Results. During the first disc passage, NOAA AR 11591, $B_text{ver}$ remains constant at 1693 G with a root-mean-square deviation of 15 G, whereas the magnetic field strength varies substantially (mean 2171 G, rms of 48 G) and shows a long term variation. Compensating for formation height has little influence on the mean value along each contour, but reduces the variations along the contour when away from disc centre, yielding a better match between the contours of $B_text{ver}=1693$ G and $I_text{c}=0.5I_text{qs}$. Conclusions. During the disc passage of a stable sunspot, its umbral boundary can equivalently be defined by using the continuum intensity $I_text{c}$ or the vertical magnetic field component $B_text{ver}$. Contours of fixed magnetic field strength fail to outline the umbral boundary." @default.
- W2896429192 created "2018-10-26" @default.
- W2896429192 creator A5033364971 @default.
- W2896429192 creator A5051476140 @default.
- W2896429192 creator A5076867796 @default.
- W2896429192 date "2018-10-22" @default.
- W2896429192 modified "2023-10-16" @default.
- W2896429192 title "Magnetic properties of a long-lived sunspot - Vertical magnetic field at the umbral boundary" @default.
- W2896429192 cites W1538737592 @default.
- W2896429192 cites W1603870981 @default.
- W2896429192 cites W1964286371 @default.
- W2896429192 cites W1981038215 @default.
- W2896429192 cites W1990324383 @default.
- W2896429192 cites W1999016464 @default.
- W2896429192 cites W1999951101 @default.
- W2896429192 cites W2001629056 @default.
- W2896429192 cites W2064502426 @default.
- W2896429192 cites W2078826727 @default.
- W2896429192 cites W2094483427 @default.
- W2896429192 cites W2123204707 @default.
- W2896429192 cites W2158612941 @default.
- W2896429192 cites W2171062718 @default.
- W2896429192 cites W2560506902 @default.
- W2896429192 cites W3100693796 @default.
- W2896429192 cites W3101777878 @default.
- W2896429192 cites W3103405095 @default.
- W2896429192 cites W9008849 @default.
- W2896429192 hasPublicationYear "2018" @default.
- W2896429192 type Work @default.
- W2896429192 sameAs 2896429192 @default.
- W2896429192 citedByCount "4" @default.
- W2896429192 countsByYear W28964291922020 @default.
- W2896429192 crossrefType "journal-article" @default.
- W2896429192 hasAuthorship W2896429192A5033364971 @default.
- W2896429192 hasAuthorship W2896429192A5051476140 @default.
- W2896429192 hasAuthorship W2896429192A5076867796 @default.
- W2896429192 hasBestOaLocation W28964291921 @default.
- W2896429192 hasConcept C115260700 @default.
- W2896429192 hasConcept C121332964 @default.
- W2896429192 hasConcept C127313418 @default.
- W2896429192 hasConcept C134306372 @default.
- W2896429192 hasConcept C151730666 @default.
- W2896429192 hasConcept C197370839 @default.
- W2896429192 hasConcept C2779343474 @default.
- W2896429192 hasConcept C33923547 @default.
- W2896429192 hasConcept C44870925 @default.
- W2896429192 hasConcept C62354387 @default.
- W2896429192 hasConcept C62520636 @default.
- W2896429192 hasConcept C71907059 @default.
- W2896429192 hasConceptScore W2896429192C115260700 @default.
- W2896429192 hasConceptScore W2896429192C121332964 @default.
- W2896429192 hasConceptScore W2896429192C127313418 @default.
- W2896429192 hasConceptScore W2896429192C134306372 @default.
- W2896429192 hasConceptScore W2896429192C151730666 @default.
- W2896429192 hasConceptScore W2896429192C197370839 @default.
- W2896429192 hasConceptScore W2896429192C2779343474 @default.
- W2896429192 hasConceptScore W2896429192C33923547 @default.
- W2896429192 hasConceptScore W2896429192C44870925 @default.
- W2896429192 hasConceptScore W2896429192C62354387 @default.
- W2896429192 hasConceptScore W2896429192C62520636 @default.
- W2896429192 hasConceptScore W2896429192C71907059 @default.
- W2896429192 hasLocation W28964291921 @default.
- W2896429192 hasLocation W28964291922 @default.
- W2896429192 hasLocation W28964291923 @default.
- W2896429192 hasOpenAccess W2896429192 @default.
- W2896429192 hasPrimaryLocation W28964291921 @default.
- W2896429192 hasRelatedWork W1519784798 @default.
- W2896429192 hasRelatedWork W1538737592 @default.
- W2896429192 hasRelatedWork W187624722 @default.
- W2896429192 hasRelatedWork W1966668197 @default.
- W2896429192 hasRelatedWork W1994635718 @default.
- W2896429192 hasRelatedWork W1999016464 @default.
- W2896429192 hasRelatedWork W2018857992 @default.
- W2896429192 hasRelatedWork W2034681035 @default.
- W2896429192 hasRelatedWork W2064502426 @default.
- W2896429192 hasRelatedWork W2069193160 @default.
- W2896429192 hasRelatedWork W2085646155 @default.
- W2896429192 hasRelatedWork W2112866003 @default.
- W2896429192 hasRelatedWork W2158612941 @default.
- W2896429192 hasRelatedWork W2560506902 @default.
- W2896429192 hasRelatedWork W3098247840 @default.
- W2896429192 hasRelatedWork W3098637340 @default.
- W2896429192 hasRelatedWork W3100693796 @default.
- W2896429192 hasRelatedWork W3101416404 @default.
- W2896429192 hasRelatedWork W3101777878 @default.
- W2896429192 hasRelatedWork W3106145354 @default.
- W2896429192 isParatext "false" @default.
- W2896429192 isRetracted "false" @default.
- W2896429192 magId "2896429192" @default.
- W2896429192 workType "article" @default.