Chromospheric jets - Possible extreme-ultraviolet observations of spicules

Details Chromospheric jets - Possible extreme-ultraviolet observations of spicules Chromospheric jets - Possible extreme-ultraviolet observations of spicules

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267l..65d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 267, Apr. 1, 1983, p. L65-L68.

Astronomy and Astrophysics

Astrophysics

35

Chromosphere, Extreme Ultraviolet Radiation, Plasma Jets, Spectral Line Width, Ultraviolet Spectra, Atmospheric Circulation, H Alpha Line, Visible Spectrum

Scientific paper

Stigmatic EUV spectra of chromospheric lines obtained by the Naval Research Laboratory High Resolution Telescope and Spectrograph (HRTS) show small arc second regions with strong (10-20 km/s) Doppler shifts which are called 'chromospheric jets'. Because of the strong resemblance of their physical and statistical properties, such as temperature, density, velocity, size, and birthrate, to those of visible light spicules, it is highly likely that they are different manifestations of the same phenomena, although a one-to-one identification has not yet been made. The main difference is the 40 s lifetime of the chromospheric jets which is shorter than the 5 minute lifetime of visible light spicules. The chromospheric jets are found in the supergranular cell interiors where chromospheric and transition zone line intensities are weak. Dark H-alpha mottles found in the cell boundaries are well correlated with intense, symmetric chromospheric EUV line profiles and are only weakly related to the chromospheric jets.

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