Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Baldner, Charles"'
Autor:
Bogart, Richard S., Baldner, Charles S., Basu, Sarbani, Howe, Rachel, Soares, Maria Cristina Rabello
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:
http://arxiv.org/abs/2305.18613
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics Observatory (SDO) spacecraft. Since beginning normal science operations on 1 May 2010, HMI has operated with remarkable continuity, e.g. during the mo
Externí odkaz:
http://arxiv.org/abs/1802.01731
This work is to study the dynamics of coronal mass ejections and to investigate possible correlation between CME productivity and subsurface structure. Two CMEs and six active regions are selected for the study. The CMEs are examined by comparing obs
Externí odkaz:
http://arxiv.org/abs/1212.4300
Autor:
Baldner, Charles S., Schou, Jesper
Many helioseismic measurements suffer from substantial systematic errors. A particularly frustrating one is that time-distance measurements suffer from a large center to limb effect which looks very similar to the finite light travel time, except tha
Externí odkaz:
http://arxiv.org/abs/1210.1583
We employ ring-diagram analysis to study the sub-surface thermal structure of active regions. We present results using a large number of active regions over the course of Solar Cycle 23. We present both traditional inversions of ring-diagram frequenc
Externí odkaz:
http://arxiv.org/abs/1210.0565
Publikováno v:
2012 Solar Phys. 281, 533
While the {\it Helioseismic and Magnetic Imager} (HMI) onboard the {\it Solar Dynamics Observatory} (SDO) provides Doppler velocity [$V$], continuum intensity [$I_C$], and line-depth [$Ld$] observations, each of which is sensitive to the five-minute
Externí odkaz:
http://arxiv.org/abs/1208.1644
Autor:
Venn, Kim, Shetrone, Matthew, Irwin, Mike, Hill, Vanessa, Jablonka, Pascale, Tolstoy, Eline, Lemasle, Bertrand, Divell, Mike, Starkenburg, Else, Letarte, Bruno, Baldner, Charles, Battaglia, Giuseppina, Helmi, Amina, Kaufer, Andreas, Primas, Francesca
The detailed abundances of 23 elements in nine bright RGB stars in the Carina dSph are presented based on high resolution spectra gathered at the VLT and Magellan telescopes. A spherical model atmospheres analysis is applied using standard methods to
Externí odkaz:
http://arxiv.org/abs/1204.0787
High degree solar mode frequencies as measured by ring diagrams are known to change in the presence of the strong magnetic fields found in active regions. We examine these changes in frequency for a large sample of active regions analyzed with data f
Externí odkaz:
http://arxiv.org/abs/1104.3867
Autor:
Stello, Dennis, Basu, Sarbani, Bruntt, Hans, Mosser, Benoit, Stevens, Ian R., Brown, Timothy M., Christensen-Dalsgaard, Jorgen, Gilliland, Ronald L., Kjeldsen, Hans, Arentoft, Torben, Ballot, Jerome, Barban, Caroline, Bedding, Timothy R., Chaplin, William J., Elsworth, Yvonne P., Garcia, Rafael A., Goupil, Marie-Jo, Hekker, Saskia, Huber, Daniel, Mathur, Savita, Meibom, Soren, Samadi, Reza, Sangaralingam, Vinothini, Baldner, Charles S., Belkacem, Kevin, Biazzo, Katia, Brogaard, Karsten, Suarez, Juan Carlos, D'Antona, Francesca, Demarque, Pierre, Esch, Lisa, Gai, Ning, Grundah, Frank, Lebreton, Yveline, Jiang, Biwei, Jevtic, Nada, Karoff, Christoffer, Miglio, Andrea, Molenda-Zakowicz, Joanna, Montalban, Josefina, Noels, Arlette, Cortes, Teodoro Roca, Roxburgh, Ian W., Serenelli, Aldo M., Aguirre, Victor Silva, Sterken, Christiaan, Stine, Peter, Szabo, Robert, Weiss, Achim, Borucki, William J., Koch, David, Jenkins, Jon M.
Asteroseismology of stars in clusters has been a long-sought goal because the assumption of a common age, distance and initial chemical composition allows strong tests of the theory of stellar evolution. We report results from the first 34 days of sc
Externí odkaz:
http://arxiv.org/abs/1001.0026
Publikováno v:
Astrophys.J.705:1704-1713,2009
Normal modes of oscillation of the Sun are useful probes of the solar interior. In this work, we use the even-order splitting coefficients to study the evolution of magnetic fields in the convection zone over solar cycle 23, assuming that the frequen
Externí odkaz:
http://arxiv.org/abs/0910.1597