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- W1965388617 abstract "view Abstract Citations (13) References (2) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Time-resolved spectral observations of spicule velocities at several heights Sirajul Hasan, S. ; Keil, S. L. Abstract The vacuum telescope of the National Solar Observatory, Sacramento Peak was used to obtain H-alpha spectral observations of spicules. A set of spectra corresponding to five slit positions above the solar limb were recorded every 8 s in order to study the temporal variation of spicules at several heights with high space and time resolution. The short time interval (less than 2 s) between exposures at each height is a new feature of these observations. A typical flow event in a spicule was found to last 10-15 minutes. During this period the velocity did not reverse sign. The temporal behavior of the velocity at different heights in a spicule appeared to show a high correlation, with a time lag less than 7 s, implying signal propagation speeds greater than 300 km/s. Finally, no significant variation of spicule velocity with height in the chromosphere was noticed. Publication: The Astrophysical Journal Pub Date: August 1984 DOI: 10.1086/184337 Bibcode: 1984ApJ...283L..75S Keywords: Chromosphere; Solar Spectra; Spicules; H Alpha Line; Propagation Velocity; Temporal Distribution; Solar Physics full text sources ADS |" @default.
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- W1965388617 date "1984-08-01" @default.
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- W1965388617 title "Time-resolved spectral observations of spicule velocities at several heights" @default.
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