Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..763a&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Other
Solar Corona: Waves
Scientific paper
The study of short period coronal waves from observations performed using the 16" coronagraph of Sacramento Peak Observatory (USA) are described. The line of FeXIV at 530.3 nm is measured along a time sequence. The subtraction of sky Aureola fluctuations of the nearby continuum in the scattered-light spectrum has been done. The observations presented were obtained on Jul. 20, 2000 during an excellent "Coronal" day and high activity level on the Sun. Spectra were taken at constant height above the limb with a slit width of 100 micron, 40" above the limb. We took a large enough portion of the spectra around 530.3 nm, with a dispersion of .252 nm/mm-1 and an equivalent instrumental spectral width of 0.025 nm, every 8s of time. Simultaneously, slit-jaw pictures were taken every 8s in Hα. We have used the Image Processing Method and Image Tools software for the analysis. Such studies have been performed already by S. Koutchmy at al., 1983, but using another method. The method is now based on the obvious quasi-linear relationship of the line wing intensity modulations and the line shifts. As a result, coronal waves in the short period range (32s) have been obtained. These waves are considered as good candidates for the problem of coronal heating which has not yet received a satisfactory answer. Also, power spectrum of the central density variations of the 530.3 line and power spectrum of the velocity variations deduced from Doppler shift measurements have been obtained.
Adjabshirizadeh Ali
Mahmoudzadeh A.
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