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SDO Observations of Solar Jets

  • ADVANCES IN EUROPEAN SOLAR PHYSICS
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Abstract

We present an analysis of high cadence observations of solar jets observed in the Extreme Ultraviolet (EUV), at 304 Å, with the Atmospheric Imaging Assembly instrument aboard the Solar Dynamics Observatory (SDO). The jets in our sample lie very close to the solar limb to minimize projection effects. Two of the events show clear helical patterns during ejection. We also find that some of the jets are recurrent and that most of them cannot overcome solar gravity.

We investigate the temporal evolution of the jets by measuring the height of their leading edge as a function of time. By fitting the resulting height–time diagrams, we derive the magnitude of their initial ejection speed and plasma acceleration by assuming ballistic motion. Moreover, we calculate the upward acceleration of the jets based on the dynamical velocity of the plasma, without assuming a ballistic motion. In both models, the acceleration profiles suggest the influence of forces other than gravity. In particular, we find indications of an upwards driving force which weakens the decelerating effect of the solar gravitational field along the motion of the jet. This force is larger in the dynamical model, which indicates that the ballistic approximation does not properly determine the rising motion of the plasma jets.

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Acknowledgements

We thank the referee for the useful comments, which have improved the manuscript. SDO is a mission of NASA’s Living With a Star Program. A.V. is supported by NASA contract S-136361-Y. S.P.M. acknowledges financial support by the Alexander Onassis Public Benefit Foundation and also the Foundation for Education and European Culture (IPEP) in Greece. The work presented here is supported by the Hellenic National Network for Space Research (HNSR), MIS 377274 (Thalis).

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Authors and Affiliations

  1. Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, Panepistimiopolis, 157 84, Zografos, Greece

    S. P. Moschou, K. Tsinganos & V. Archontis

  2. National Observatory of Athens, Lofos Nymphon, Thissio, Athens, Greece

    K. Tsinganos

  3. Space Sciences Division, Naval Research Laboratory, Washington, DC, 20375, USA

    A. Vourlidas

  4. School of Mathematics and Statistics, St. Andrews University, St. Andrews, KY16 9SS, UK

    V. Archontis

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  1. S. P. Moschou
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  2. K. Tsinganos
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  3. A. Vourlidas
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  4. V. Archontis
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Correspondence to K. Tsinganos.

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Advances in European Solar Physics

Guest Editors: Valery M. Nakariakov, Manolis K. Georgoulis, and Stefaan Poedts

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Moschou, S.P., Tsinganos, K., Vourlidas, A. et al. SDO Observations of Solar Jets. Sol Phys 284, 427–438 (2013). https://doi.org/10.1007/s11207-012-0190-7

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