Zobrazeno 1 - 10
of 118
pro vyhledávání: '"S, Bogart"'
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 2, p 143 (2024)
The gradient of rotation in the near-surface shear layer (NSSL) of the Sun provides valuable insights into the dynamics associated with the solar activity cycle and the dynamo. Results obtained with global oscillation mode splittings lack resolution
Externí odkaz:
https://doaj.org/article/b5c64d4896c94c6aa442d72c504097c1
Autor:
Richard S. Bogart, Charles S. Baldner, Sarbani Basu, Rachel Howe, Maria Cristina Rabello Soares
Publikováno v:
The Astrophysical Journal Letters, Vol 950, Iss 2, p L21 (2023)
We present evidence of hitherto undiscovered global-scale oscillations in the near-surface shear layer of the Sun. These oscillations are seen as large-scale variations of radial shear in both the zonal and meridional flows relative to their mean val
Externí odkaz:
https://doaj.org/article/1f9df725a34c4d4f9f734794ecc52e91
Autor:
Damien Fournier, Zhi-Chao Liang, Yuto Bekki, Robert H. Cameron, Bastian Proxauf, Cilia Damiani, Laura Hyest, Aaron C. Birch, B. Lekshmi, Allan Sacha Brun, Laurent Gizon, Richard S. Bogart, Kiran Jain
The oscillations of a slowly rotating star have long been classified into spheroidal and toroidal modes. The spheroidal modes include the well-known 5-min acoustic modes used in helioseismology. Here we report observations of the Sun's toroidal modes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9e91ccc143d0a9b3a3492d3215c80e3
http://arxiv.org/abs/2107.09499
http://arxiv.org/abs/2107.09499
Autor:
Philip H. Scherrer, R. S. Bogart, Sebastien Couvidat, Yijin Liu, J. T. Hoeksema, T. L. Duvall, Jesper Schou, R. I. Bush, Aimee A. Norton
Publikováno v:
Solar Physics. 291:1887-1938
NASA's Solar Dynamics Observatory (SDO) was launched 11 February 2010 with 3 instruments on board, including the Helioseismic and Magnetic Imager (HMI). Since beginning normal operations on 1 May 2010, HMI has observed the Sun's entire visible disk a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4d8d1d0cb4c5624abd2e65b83d3000e4
https://doi.org/10.1007/s11207-016-0957-3
https://doi.org/10.1007/s11207-016-0957-3
Autor:
Aaron C. Birch, Bastian Proxauf, Jesper Schou, Laurent Gizon, Richard S. Bogart, Björn Löptien
Publikováno v:
Astronomy & Astrophysics
Global-scale Rossby waves have recently been unambiguously identified on the Sun. Here we study the latitude and depth dependence of the Rossby wave eigenfunctions. By applying helioseismic ring-diagram analysis and granulation tracking to SDO/HMI ob
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5142b8d2e040bf14cf94d04f040ba0ae
https://doi.org/10.1051/0004-6361/201937007
https://doi.org/10.1051/0004-6361/201937007
Autor:
Jesper Schou, Ulrich R. Christensen, Thomas L. Duvall, Aaron C. Birch, Björn Löptien, Bastian Proxauf, Richard S. Bogart, Laurent Gizon
The Sun's complex dynamics is controlled by buoyancy and rotation in the convection zone and by magnetic forces in the atmosphere and corona. While small-scale solar convection is well understood, the dynamics of large-scale flows in the solar convec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9b194c199692b5889aff1e4da0f05e1c
We analyze the effect of a sunspot in its quiet surroundings applying a helioseismic technique on almost three years of Helioseismic and Magnetic Imager (HMI) observations obtained during solar cycle 24 to further study the sunspot structure below th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d9591c66f22051295999093b93e7b12
In order to quantify the influence of magnetic fields on acoustic mode parameters and flows in and around active regions, we analyse the differences in the parameters in magnetically quiet regions nearby an active region (which we call `nearby region
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c5f45656e33afbfbdd726656e41da19
Publikováno v:
Astronomische Nachrichten. 333:1013-1017
We apply the ring-diagram technique to analyze three active regions located near the central meridian. Using Doppler, continuum intensity, and line depth images from the Helioseismic Magnetic Imager (HMI), we investigate the variation in the high-deg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::851566c610a7a192a2840b4e0ec50de3
https://doi.org/10.1002/asna.201211823
https://doi.org/10.1002/asna.201211823