Skip to main content Accessibility help
×
Home

Gravitational Distortions of the Shape of the Sun: Constraints on the Models

  • J. P. Rozelot (a1) and S. Lefebvre (a1)

Abstract

Due to its own rotation, it is expected that the visual figure of the Sun is a spheroid; this is not truly the case because the solar rotation is not constant both over all heliographic latitudes and in depth. The photospheric shape is thus sensitive to the interior structure: accurate measurements of both limb shape distortions and solar rotation rates determination provide useful constraints on the internal layers (density, shear zones, …). We show why and how the implication of the successive gravitational moments are important to probe the solar interior, and we compare measurements obtained either from space (SOHO/MDI) or from ground-based experiments (scanning heliometer at the Pic du Midi). The found faint departures to the sphericity, not exceeding 22 mas, could explain fluctuations that are not yet taken into account in the classical modelling of the solar irradiance. A crude model could explain the asphericities which is based on a core rotating at a nearly uniform rate combined with a prolate tachocline and an oblate outer convective zone.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Gravitational Distortions of the Shape of the Sun: Constraints on the Models
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Gravitational Distortions of the Shape of the Sun: Constraints on the Models
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Gravitational Distortions of the Shape of the Sun: Constraints on the Models
      Available formats
      ×

Copyright

References

Hide All
Armstrong, J., Kuhn, J.R. 1999, ApJ 525, 533
Dikpati, M., Gilman, P.A. 2001, ApJ 552, 348
Lydon, T.J., Sofia, S. 1996, Phys. Rev. Lett 76, 177
Paterno, L., Sofia, S. Di Mauro, M.P. 1996, A&A 314, 940
Pijpers, F.P. 1998, MNRAS 297, 76
Rozelot, J.P., Bois, E. 1998, ASP-CPS 140, 7582
Rozelot, J.P., Lefebvre, S. 2002, in: Springer, (ed), Lecture Notes in Physics in press

Related content

Powered by UNSILO

Gravitational Distortions of the Shape of the Sun: Constraints on the Models

  • J. P. Rozelot (a1) and S. Lefebvre (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.