期刊缩写       ESA BULL-EUR SPACE

期刊全称       ESA BULLETIN-EUROPEAN SPACE AGENCY 《欧洲航天局通报》

出版国家       FRANCE

出版周期       Quarterly

出版年份       1975

期刊ISSN       0376-4265

2012-2013最新影响因子     1.064

 

 

This is the Agency's quarterly magazine informing the space-interested public of the Agency's activities.

 

solar spicules and jets

 

E. Tavabi, S. Koutchmy, A. Ajabshirizadeh

ESA bulletin. Bulletin ASE. European Space Agency (Impact Factor: 1.06). 06/2012; DOI:10.1051/eas/1255009

ABSTRACT In order to clear up the origin and possibly explain some solar limb and disc spicule quasi-periodic recurrences produced by overlapping effects, we present a simulation model assuming quasi- random positions of spicules. We also allow a set number of spicules with different physical properties (such as: height, lifetime and tilt angle as shown by an individual spicule) occurring randomly.

Results of simulations made with three different spatial resolutions of the corresponding frames and also for different number density of spicules, are analyzed. The wavelet time/frequency method is used to obtain the exact period of spicule visibility. Results are compared with observations of the chromosphere from i/ the Transition Region and Coronal Explorer (TRACE) filtergrams taken at 1600 angstrom, ii/ the Solar Optical Telescope (SOT) of Hinode taken in the Ca II H-line and iii/ the Sac-Peak Dunn's VTT taken in H? line. Our results suggest the need to be cautious when interpreting apparent oscillations seen in spicule image sequences when overlapping is present, i.e.; when the spatial resolution is not enough to resolve individual components of spicules.