Are granules good tracers of solar surface velocity fields?
(2001) In Astronomy & Astrophysics 377. p.14-17- Abstract
- Using a numerical simulation of compressible convection with radiativetransfer mimicking the solar photosphere, we compare the velocity fieldderived from granule motions to the actual velocity field of the plasma.We thus test the idea that granules may be used to trace large-scalevelocity fields at the sun's surface. Our results show that this isindeed the case provided the scale separation is sufficient. We thusestimate that neither velocity fields at scales less than 2500 km nortime evolution at scales shorter than 0.5 hr can be faithfully describedby granules. At larger scales the granular motions correlate linearlywith the underlying fluid motions with a slope of ≲2 reachingcorrelation coefficients up to ~ 0.9.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/130140
- author
- Rieutord, M ; Roudier, T ; Ludwig, Hans-Günter LU ; Nordlund, Å and Stein, R
- organization
- publishing date
- 2001
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- CONVECTION, SUN: GRANULATION, SUN: PHOTOSPHERE
- in
- Astronomy & Astrophysics
- volume
- 377
- pages
- 14 - 17
- publisher
- EDP Sciences
- external identifiers
-
- scopus:0035493989
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361:20011160
- language
- English
- LU publication?
- yes
- id
- d1ad6668-0500-43ce-8f96-7a10fb5634cf (old id 130140)
- date added to LUP
- 2016-04-01 15:56:03
- date last changed
- 2024-01-10 22:26:34
@article{d1ad6668-0500-43ce-8f96-7a10fb5634cf, abstract = {{Using a numerical simulation of compressible convection with radiativetransfer mimicking the solar photosphere, we compare the velocity fieldderived from granule motions to the actual velocity field of the plasma.We thus test the idea that granules may be used to trace large-scalevelocity fields at the sun's surface. Our results show that this isindeed the case provided the scale separation is sufficient. We thusestimate that neither velocity fields at scales less than 2500 km nortime evolution at scales shorter than 0.5 hr can be faithfully describedby granules. At larger scales the granular motions correlate linearlywith the underlying fluid motions with a slope of ≲2 reachingcorrelation coefficients up to ~ 0.9.}}, author = {{Rieutord, M and Roudier, T and Ludwig, Hans-Günter and Nordlund, Å and Stein, R}}, issn = {{0004-6361}}, keywords = {{CONVECTION; SUN: GRANULATION; SUN: PHOTOSPHERE}}, language = {{eng}}, pages = {{14--17}}, publisher = {{EDP Sciences}}, series = {{Astronomy & Astrophysics}}, title = {{Are granules good tracers of solar surface velocity fields?}}, url = {{https://lup.lub.lu.se/search/files/4517682/624121.pdf}}, doi = {{10.1051/0004-6361:20011160}}, volume = {{377}}, year = {{2001}}, }