The evolution of solar bipolar jets observed in the UV by SUMER on SOHO.

Astronomy and Astrophysics – Astronomy

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Scientific paper

Observations of bipolar jets made in the UV by SUMER onboard SOHO are presented. The observations were carried out in the interval 74.9-79.0 nm which contains some chromospheric and transition region lines. The theory predicts that under the conditions of the solar chromosphere the reconnection of magnetic lines accelerates plasma into two oppositely directed jets. In the chromosphere, as well as in other solar layers, different phenomena, where plasma acceleration take place, are observed. Of them the UV jets, observed by SUMER, represent one of the most clear evidences of the link between magnetic reconnection and plasma acceleration. The jets are clearly revealed by a considerably intensity increase and large doppler shifts of the line wings. It should be noted that the enhancement of only one wing also occurs and that the central component of the line also undergoes velocity shifts and amplitude enhancement. The behavior of the wings found in this work is consistent with results obtained for other events (Innes et al. 1997) namely: 1)The wings are observed during few minutes 2) The doppler velocities of the line wings (red and blue) are similar to each other and typical values are of the order of 100 km/sec, 3) In general, the blue component is more long-lived than the red one, 4)the red component is, in general, more intense than the blue one. In this work, an analysis of the velocities of the three spectral components (the central and the wings) as a function of the location on the slit, used for the observations, is also done. The ratios of two OV (density sensitive) and two OIV (temperature sensitive) lines, whose wavelengths are in the observed range, are also analyzed. An important result is that these parameters show gradients along the slit. An analysis of the spatial distributions and the correlations between them is done. A discussion of these results, in relation with the appearance and the evolution of the jets, will be done.

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