Presentation on theme: "...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."— Presentation transcript:
...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)
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. 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
... 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