Physics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..67b&link_type=abstract
Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L67-L70
Physics
16
Chromosphere, Dynamic Characteristics, Fourier Analysis, Magnetohydrodynamics, Solar Corona, Solar Magnetic Field, Solar Oscillations, Solar Physics, Sun, Birefringent Filters, Charge Coupled Devices, Spectrographs, Telephotometry, Telescopes, Temporal Resolution
Scientific paper
We present the results of a comparative analysis of an 83 minute time sequence of spectra taken around the Ca II and He I 1083 lines, near the center of the solar disk and away from active regions. We discuss the behavior of the Fourier spectra at low frequency: 3 minute oscillations are well observed out of the network, and 5 minute oscillation waves are prominent in the network. The 5 s sampling time also permits the observation of the high-frequency part of the Fourier spectra of intensity and velocity fluctuations at different heights. At high frequencies, K2V-K2R and 1083 (velocity) results differ when magnetic and non-magnetic regions are compared.
Bocchialini Karine
Koutchmy Serge
Vial Jean-Claude
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