...a case in point?use of the SST, numerical simulations, and ひ

ので in modelling dynamic fibrils, spicules, and mottles

Romforskningsutvalget ved ITA20-mars 2007

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H-alpha core 4-oct-2005

• Taken at the SST by Luc Rouppe van der Voort and Michiel van Noort

Diffraction limited (0.2”), Ha linecenter at 1 s cadence, from 8:50 to 10:10 UT, m=0.78 (S8, E37)

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Dynamic Fibrils Evolution

3d MHD simulations

• 3d Oslo Stagger Code; 5th order spatial interpolation, 3d order time stepping

• Non-grey radiative transfer w/ scattering the chromosphere; optically thin radiation in lower transition region and corona

• Thermal conduction along magnetic field

• Transmitting boundaries; allow control of entropy and magnetic field configuration that enters the computational box from below

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Simulated Dynamic FibrilsHansteen, De Pontieu et al. 2006 ApJL 647, L73-L76 De Pontieu, Hansteen et al. 2007 ApJ 655, 624-641

Observations vs. Simulations xt-plots

• Spicule-like features in simulations - due upwardly propagating shocks -show parabolic paths similar to those observed in DFs, as well as a host of other similarities...

Observations Simulations

Observations vs. Simulations velocity/deceleration

• The correlation between maximum velocity along a DF and the deceleration is well reproduced by simulations. It is a consequence of the shock acceleration of dynamic fibrils.

Rouppe van der Voort et al. 2007 ApJL, in press

• Japan/US/UK mission (Norway, ESA)

• Downlink at Svalbard

• Quick Look Software

• European Data Center in Oslo

ひので（ Hinode) Launch

September 23, 2006

EIS observations of the upper atmosphere

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... and indeed spicules at the limb

SOT observations Ca Hshow many dynamic phenomena...

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Oslo Stagger Code simulationof SOT Ca H at the limb

...simulation to be shown at NASA’s Hinode press conference tomorrow March 21, 2007.

•combination of simulation and observation is a very powerful tool

•ground based and space based methods are complimentary

•access to and expertise in all three methods has allowed the solar group at ITA to be a leader in the field