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- A A Norton, J Pietarila Graham, +8 authors P H Scherrer
- 2006

We present a study of two spectral lines, Fe I 6173 Å and Ni I 6768 Å, that were candidates to be used in the Helioseismic and Magnetic Imager (HMI) for observing Doppler velocity and the vector magnetic field. The line profiles were studied using the Mt. Wilson Observatory, the Advanced Stokes Polarimeter and the Kitt Peak McMath telescope and one meter… (More)

- Jonathan Pietarila Graham, Darryl D Holm, Pablo D Mininni, Annick Pouquet
- Physical review. E, Statistical, nonlinear, and…
- 2007

We compute solutions of the Lagrangian-averaged Navier-Stokes alpha - (LANS alpha ) model for significantly higher Reynolds numbers (up to Re approximately 8300 ) than have previously been accomplished. This allows sufficient separation of scales to observe a Navier-Stokes inertial range followed by a second inertial range specific to the LANS alpha model.… (More)

- Jonathan Pietarila Graham, Eric G Blackman, Pablo D Mininni, Annick Pouquet
- Physical review. E, Statistical, nonlinear, and…
- 2012

Understanding the in situ amplification of large-scale magnetic fields in turbulent astrophysical rotators has been a core subject of dynamo theory. When turbulent velocities are helical, large-scale dynamos that substantially amplify fields on scales that exceed the turbulent forcing scale arise, but the minimum sufficient fractional kinetic helicity… (More)

- Jonathan Pietarila Graham, Pablo D Mininni, Annick Pouquet
- Physical review. E, Statistical, nonlinear, and…
- 2009

We demonstrate that, for the case of quasiequipartition between the velocity and the magnetic field, the Lagrangian-averaged magnetohydrodynamics (LAMHD) alpha model reproduces well both the large-scale and the small-scale properties of turbulent flows; in particular, it displays no increased (superfilter) bottleneck effect with its ensuing enhanced energy… (More)

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