Abstract
Supergranulation is one of the most visible length scales of solar convection and has been studied extensively by local helioseismology. We use synthetic data computed with the Seismic Propagation through Active Regions and Convection (SPARC) code to test regularized-least squares (RLS) inversions of helioseismic-holography measurements for a supergranulation-like flow. The code simulates the acoustic wavefield by solving the linearized three-dimensional Euler equations in Cartesian geometry. We model a single supergranulation cell with a simple, axisymmetric, mass-conserving flow. The use of simulated data provides an opportunity for direct evaluation of the accuracy of measurement and inversion techniques. The RLS technique applied to helioseismic-holography measurements is generally successful in reproducing the structure of the horizontal-flow field of the model supergranule cell. The errors are significant in horizontal-flow inversions near the top and bottom of the computational domain as well as in vertical-flow inversions throughout the domain. We show that the errors in the vertical velocity are due largely to cross talk from the horizontal velocity.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 361-378 |
| Number of pages | 18 |
| Journal | Solar Physics |
| Volume | 282 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 1 2013 |
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Keywords
- Helioseismology, direct modeling
- Helioseismology, inverse modeling
- Interior, convection zone
- Supergranulation
- Velocity fields, interior
- Waves, propagation
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data. / Dombroski, D. E.; Birch, A. C.; Braun, D. C.; Hanasoge, Shravan.
In: Solar Physics, Vol. 282, No. 2, 01.01.2013, p. 361-378.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Testing Helioseismic-Holography Inversions for Supergranular Flows Using Synthetic Data
AU - Dombroski, D. E.
AU - Birch, A. C.
AU - Braun, D. C.
AU - Hanasoge, Shravan
PY - 2013/1/1
Y1 - 2013/1/1
N2 - Supergranulation is one of the most visible length scales of solar convection and has been studied extensively by local helioseismology. We use synthetic data computed with the Seismic Propagation through Active Regions and Convection (SPARC) code to test regularized-least squares (RLS) inversions of helioseismic-holography measurements for a supergranulation-like flow. The code simulates the acoustic wavefield by solving the linearized three-dimensional Euler equations in Cartesian geometry. We model a single supergranulation cell with a simple, axisymmetric, mass-conserving flow. The use of simulated data provides an opportunity for direct evaluation of the accuracy of measurement and inversion techniques. The RLS technique applied to helioseismic-holography measurements is generally successful in reproducing the structure of the horizontal-flow field of the model supergranule cell. The errors are significant in horizontal-flow inversions near the top and bottom of the computational domain as well as in vertical-flow inversions throughout the domain. We show that the errors in the vertical velocity are due largely to cross talk from the horizontal velocity.
AB - Supergranulation is one of the most visible length scales of solar convection and has been studied extensively by local helioseismology. We use synthetic data computed with the Seismic Propagation through Active Regions and Convection (SPARC) code to test regularized-least squares (RLS) inversions of helioseismic-holography measurements for a supergranulation-like flow. The code simulates the acoustic wavefield by solving the linearized three-dimensional Euler equations in Cartesian geometry. We model a single supergranulation cell with a simple, axisymmetric, mass-conserving flow. The use of simulated data provides an opportunity for direct evaluation of the accuracy of measurement and inversion techniques. The RLS technique applied to helioseismic-holography measurements is generally successful in reproducing the structure of the horizontal-flow field of the model supergranule cell. The errors are significant in horizontal-flow inversions near the top and bottom of the computational domain as well as in vertical-flow inversions throughout the domain. We show that the errors in the vertical velocity are due largely to cross talk from the horizontal velocity.
KW - Helioseismology, direct modeling
KW - Helioseismology, inverse modeling
KW - Interior, convection zone
KW - Supergranulation
KW - Velocity fields, interior
KW - Waves, propagation
UR - http://www.scopus.com/inward/record.url?scp=84871926849&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871926849&partnerID=8YFLogxK
U2 - 10.1007/s11207-012-0189-0
DO - 10.1007/s11207-012-0189-0
M3 - Article
VL - 282
SP - 361
EP - 378
JO - Solar Physics
JF - Solar Physics
SN - 0038-0938
IS - 2
ER -