Coronal response of Bi-directional Jets |
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| Authors: | Doyle JG Madjarska MS Dzif?ÁkovÁ E Dammasch IE |
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| Institution: | (1) Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland;(2) Mullard Space Science Laboratory, UCL, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, U.K.;(3) Astronomical Institute, Faculty of Mathematics, Physics and Informatics, Comenius University Mlynská dolina, 842 48 Bratislava 4, Slovakia |
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| Abstract: | EUV bi-directional jets are a prominent class of phenomena characterizing the solar transition region. Using simultaneously obtained SUMER observations in the chromospheric Si ii 1251.16 Å and C i 1251.17 Å, transition region N v 1238.8 Å and coronal Mg x 625 Å lines we show an example of a bi-directional jet observed in the chromospheric and the transition region lines but not showing any detectable signature in the coronal line. The phenomenon, however, was also clearly detected by the TRACE imager with the 171 Å filter. This discrepancy is explained here with a non-Maxwellian electron distribution which makes a significant fraction of the plasma in the TRACE 171 Å pass-band to be derived from temperatures around ≈ 300 000 K, as opposed to ≈ 800 000 K. This could have implications for other phenomena observed in the TRACE pass-bands, including the transition region ‘moss’ and the 3- and 5-min oscillations. |
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