Matches in SemOpenAlex for { <https://semopenalex.org/work/W1994828080> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W1994828080 endingPage "801" @default.
- W1994828080 startingPage "793" @default.
- W1994828080 abstract "Birmingham Solar Oscillations Network (BiSON) instruments use resonant scattering spectrometers to make unresolved Doppler velocity observations of the Sun. Unresolved measurements are not homogenous across the solar disc and so the observed data do not represent a uniform average over the entire surface. The influence on the inhomogeneity of the solar rotation and limb darkening has been considered previously (Brookes et al. 1978a) and is well understood. Here we consider a further effect that originates from the instrumentation itself. The intensity of light observed from a particular region on the solar disc is dependent on the distance between that region on the image of the solar disc formed in the instrument and the detector. The majority of BiSON instruments have two detectors positioned on opposite sides of the image of the solar disc and the observations made by each detector are weighted towards differing regions of the disc. Therefore the visibility and amplitudes of the solar oscillations and the realization of the solar noise observed by each detector will differ. We find that the modelled bias is sensitive to many different parameters such as the width of solar absorption lines, the strength of the magnetic field in the resonant scattering spectrometer, the orientation of the Sun's rotation axis, the size of the image observed by the instrument and the optical depth in the vapour cell. We find that the modelled results best match the observations when the optical depth at the centre of the vapour cell is 0.55. The inhomogeneous weighting means that a `velocity offset' is introduced into unresolved Doppler velocity observations of the Sun, which varies with time, and so has an impact on the long-term stability of the observations." @default.
- W1994828080 created "2016-06-24" @default.
- W1994828080 creator A5008619478 @default.
- W1994828080 creator A5044882672 @default.
- W1994828080 creator A5052715174 @default.
- W1994828080 creator A5080024368 @default.
- W1994828080 date "2009-08-01" @default.
- W1994828080 modified "2023-09-24" @default.
- W1994828080 title "New aspects of Doppler imaging in Sun-as-a-star observations" @default.
- W1994828080 cites W1980080900 @default.
- W1994828080 cites W1989223802 @default.
- W1994828080 cites W1997556910 @default.
- W1994828080 cites W2013327250 @default.
- W1994828080 cites W2059119404 @default.
- W1994828080 doi "https://doi.org/10.1111/j.1365-2966.2009.15011.x" @default.
- W1994828080 hasPublicationYear "2009" @default.
- W1994828080 type Work @default.
- W1994828080 sameAs 1994828080 @default.
- W1994828080 citedByCount "7" @default.
- W1994828080 countsByYear W19948280802012 @default.
- W1994828080 countsByYear W19948280802014 @default.
- W1994828080 countsByYear W19948280802015 @default.
- W1994828080 countsByYear W19948280802017 @default.
- W1994828080 countsByYear W19948280802021 @default.
- W1994828080 crossrefType "journal-article" @default.
- W1994828080 hasAuthorship W1994828080A5008619478 @default.
- W1994828080 hasAuthorship W1994828080A5044882672 @default.
- W1994828080 hasAuthorship W1994828080A5052715174 @default.
- W1994828080 hasAuthorship W1994828080A5080024368 @default.
- W1994828080 hasBestOaLocation W19948280802 @default.
- W1994828080 hasConcept C103962331 @default.
- W1994828080 hasConcept C115961682 @default.
- W1994828080 hasConcept C120665830 @default.
- W1994828080 hasConcept C121332964 @default.
- W1994828080 hasConcept C123403432 @default.
- W1994828080 hasConcept C1276947 @default.
- W1994828080 hasConcept C142757262 @default.
- W1994828080 hasConcept C154945302 @default.
- W1994828080 hasConcept C183682340 @default.
- W1994828080 hasConcept C2524010 @default.
- W1994828080 hasConcept C33390570 @default.
- W1994828080 hasConcept C33923547 @default.
- W1994828080 hasConcept C41008148 @default.
- W1994828080 hasConcept C44870925 @default.
- W1994828080 hasConcept C74050887 @default.
- W1994828080 hasConcept C94915269 @default.
- W1994828080 hasConcept C99498987 @default.
- W1994828080 hasConceptScore W1994828080C103962331 @default.
- W1994828080 hasConceptScore W1994828080C115961682 @default.
- W1994828080 hasConceptScore W1994828080C120665830 @default.
- W1994828080 hasConceptScore W1994828080C121332964 @default.
- W1994828080 hasConceptScore W1994828080C123403432 @default.
- W1994828080 hasConceptScore W1994828080C1276947 @default.
- W1994828080 hasConceptScore W1994828080C142757262 @default.
- W1994828080 hasConceptScore W1994828080C154945302 @default.
- W1994828080 hasConceptScore W1994828080C183682340 @default.
- W1994828080 hasConceptScore W1994828080C2524010 @default.
- W1994828080 hasConceptScore W1994828080C33390570 @default.
- W1994828080 hasConceptScore W1994828080C33923547 @default.
- W1994828080 hasConceptScore W1994828080C41008148 @default.
- W1994828080 hasConceptScore W1994828080C44870925 @default.
- W1994828080 hasConceptScore W1994828080C74050887 @default.
- W1994828080 hasConceptScore W1994828080C94915269 @default.
- W1994828080 hasConceptScore W1994828080C99498987 @default.
- W1994828080 hasIssue "2" @default.
- W1994828080 hasLocation W19948280801 @default.
- W1994828080 hasLocation W19948280802 @default.
- W1994828080 hasLocation W19948280803 @default.
- W1994828080 hasOpenAccess W1994828080 @default.
- W1994828080 hasPrimaryLocation W19948280801 @default.
- W1994828080 hasRelatedWork W1490944650 @default.
- W1994828080 hasRelatedWork W163498089 @default.
- W1994828080 hasRelatedWork W1652911021 @default.
- W1994828080 hasRelatedWork W2007491266 @default.
- W1994828080 hasRelatedWork W2017298998 @default.
- W1994828080 hasRelatedWork W2018405315 @default.
- W1994828080 hasRelatedWork W2048773250 @default.
- W1994828080 hasRelatedWork W2139073293 @default.
- W1994828080 hasRelatedWork W2318815998 @default.
- W1994828080 hasRelatedWork W2994857684 @default.
- W1994828080 hasVolume "397" @default.
- W1994828080 isParatext "false" @default.
- W1994828080 isRetracted "false" @default.
- W1994828080 magId "1994828080" @default.
- W1994828080 workType "article" @default.