...a case in point? use of the SST, numerical simulations, and ひので in modelling dynamic fibrils, spicules, and mottles Romforskningsutvalget ved ITA 20-mars 2007

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)

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

Simulated Dynamic Fibrils Hansteen, De Pontieu et al ApJL 647, L73-L76 De Pontieu, Hansteen et al ApJ 655,

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 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

... and indeed spicules at the limb SOT observations Ca H show many dynamic phenomena...

Oslo Stagger Code simulation of 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