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Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection-Generated Velocity Pulse in AR10808

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Abstract

Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE, 171 Å), and Hα from Culgoora Solar Observatory at Narrabri, Australia, we present a unique observational signature of a propagating supersonic plasma blob before an M6.2-class solar flare in active region 10808 on 9 September 2005. The blob was observed between 05:27 UT and 05:32 UT with almost a constant shape for the first 2 – 3 min, and thereafter it quickly vanished in the corona. The observed lower-bound speed of the blob is estimated as ≈ 215 km s−1 in its dynamical phase. The evidence of the blob with almost similar shape and velocity concurrent in Hα and TRACE 171 Å images supports its formation by a multi-temperature plasma. The energy release by a recurrent three-dimensional reconnection process via the separator dome below the magnetic null point, between the emerging flux and pre-existing field lines in the lower solar atmosphere, is found to be the driver of a radial velocity pulse outwards that accelerates this plasma blob in the solar atmosphere. In support of identification of the possible driver of the observed eruption, we solve the two-dimensional ideal magnetohydrodynamic equations numerically to simulate the observed supersonic plasma blob. The numerical modelling closely match the observed velocity, evolution of multi-temperature plasma, and quick vanishing of the blob found in the observations. Under typical coronal conditions, such blobs may also carry an energy flux of 7.0×106 erg cm−2 s−1 to balance the coronal losses above active regions.

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Acknowledgements

We acknowledge the remarks of the referee during review process of our manuscript. AKS thanks SP2RC, School of Mathematics and Statistics, The University of Sheffield for the support of collaborative visit, where the part of present research work has been carried out. AKS also acknowledges discussions with Boris Filippov, M. Opher, E. Verwichte, and to Shobhna Srivastava for her support and encouragement during the work. We also acknowledge MDI/SoHO and TRACE observations used in this study. We also thank Culgoora Solar Observatory at Narrabri, Australia, to provide the H-alpha images. RE acknowledges M. Kéray for patient encouragement and is also grateful to NSF, Hungary (OTKA, Ref. No. K83133) for support received. The software used in this work was in part developed by the DOE-supported ASC/Alliance Center for Astrophysical Thermonuclear Flashes at the University of Chicago.

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  1. Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, India

    A. K. Srivastava

  2. Solar Physics and Space Plasma Research Centre (SP2RC), School of Mathematics and Statistics, The University of Sheffield, Sheffield, UK

    A. K. Srivastava & R. Erdélyi

  3. Group of Astrophysics, UMCS, ul. Radziszewskiego 10, 20-031, Lublin, Poland

    K. Murawski

  4. Astronomy and Space Science Institute (KASI), Daejeon, 305-348, Republic of Korea

    Pankaj Kumar

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Srivastava, A.K., Erdélyi, R., Murawski, K. et al. Multiwavelength Observations of Supersonic Plasma Blob Triggered by Reconnection-Generated Velocity Pulse in AR10808. Sol Phys 281, 729–747 (2012). https://doi.org/10.1007/s11207-012-0055-0

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