Temporal and center-to-limb variations of the K I 769.9 NM line profiles in quiet and active solar regions

Bibcode
1988A&A...198..322B
Bonet, J. A.; Marquez, I.; Vazquez, M.; Woehl, H.
Referencia bibliográfica

Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 322-330.

Fecha de publicación:
6
1988
Número de autores
4
Número de autores del IAC
3
Número de citas
23
Número de citas referidas
19
Descripción
The temporal and spatial behaviour of the K I 769.9 nm solar line are investigated using several series of high spectral resolution low-noise photoelectric scans obtained at Kitt Peak National Observatory in quiet and active (plages and sunspots) regions. Corrections due to the instrumental profile were applied to yield the best line shape. A systematic center-to-limb investigation of the behaviour of the line shape was performed in quiet regions. Power and phase spectra of the main parameters defining the line shape have also been determined. Within several umbrae at different cos θ positions, an inverse C-shape or even an "S"-shape of the bisectors was found.
Tipo
Con árbitro
Actividad solar
Oscilaciones solares
Manchas solares

Te puede interesar

  • Con árbitro
    Beyond the Nyquist frequency: Asteroseismic catalog of undersampled Kepler late subgiants and early red giants
    Subgiants and early red giants are crucial for studying the first dredge-up, a key evolutionary phase in which the convective envelope deepens, mixing previously interior-processed material and bringing it to the surface. Yet, very few have been seismically characterized with Kepler because their oscillation frequencies are close to the 30 minute
    Liagre, B. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.144L
    Número de citas
    0
  • Con árbitro
    An ALMA Band 7 survey of SDSS/Herschel quasars in Stripe 82: I. The properties of the 870 micron counterparts
    Context. Over the past 15 years, studies of quasars in the far-infrared (FIR) have reported host luminosities ranging from 10 12 to 10 14 L ⊙. These luminosities, often derived from Herschel/SPIRE photometry, suggest star formation rates (SFRs) of up to several thousand M ⊙ yr ‑1, positioning them among the most luminous starburst galaxies in the
    Hatziminaoglou, E. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.183H
    Número de citas
    0
  • Con árbitro
    Transit timing variations in HIP 41378: CHEOPS and TESS confirm a non-transiting sixth planet in the system
    In multiple-planet systems, gravitational interactions of exoplanets could lead to transit timing variations (TTVs), whose amplitude becomes significantly enhanced when planets are in or near mean-motion resonances (MMRs), making them more easily detectable. In cases where both TTVs and radial velocity (RV) measurements are available, combined
    Leonardi, P. et al.

    Fecha de publicación:

    10
    2025
    Bibcode
    2025A&A...702A.211L
    Número de citas
    0