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Dynamical Effects in the EUV Chromospheric Network

Published online by Cambridge University Press:  25 September 2017

F.G. Chiuderi-Drago  and
G. Poletto
F.G. Chiuderi-Drago
Affiliation:
Osservatorio Astrofisico di Arcetri, Firenze, (Italy)
G. Poletto
Affiliation:
Osservatorio Astrofisico di Arcetri, Firenze, (Italy)

Extract

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Extreme ultraviolet observations of the chromospheric network obtained by the Harvard College Observatory experiment aboard Skylab on May 31st, 1973, are analyzed.

The data, which have a spatial resolution of 5“ x 5“, cover an area of 5‘ x 5‘ near the center of the sun, where a large coronal hole was present, and are recorded in several lines formed in a range of temperatures from 104 to 106 °K.

By studying the EUV spatial intensity distribution, the average intensity in cell and network, the contrast, and the emission measures have been derived.

The network distribution, highly asymmetrical and skewed to higher intensity, suggests an inhomogeneous network structure, probably associated with the presence of spicules, not resolved by the instrument.

A dynamical model of the transition zone is therefore developed, and the resulting EUV emission in spicules is computed and compared with available observations, and with previous network models.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 10
Copyright
Copyright © Crown Research Institutes 1977