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

Abstract

Using multi-wavelength observations of Solar and Heliospheric Observatory (SoHO)/Michelson Doppler Imager (MDI), Transition Region and Coronal Explorer (TRACE) 171 Å, and H$\alpha$ 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 AR10808 on 9th September 2005. The blob was observed between 05:27 UT to 05:32 UT with almost a constant shape for the first 2-3 minutes, and thereafter it quickly vanished in the corona. The observed lower bound speed of the blob is estimated as $\sim$215 km s${}^{-1}$ in its dynamical phase. The evidence of the blob with almost similar shape and velocity concurrent in H$\alpha$ and TRACE 171 Å supports its formation by multi-temperature plasma. The energy release by a recurrent 3-D 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$\times 10^6$ ergs cm${}^{-2}$ s${}^{-1}$ to re-balance the coronal losses above active regions.

Solar Physics; 22 Pages; 8 Figures

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• Instability of current sheets and formation of plasmoid chains
• STEREO/SECCHI Stereoscopic Observations Constraining the Initiation of Polar Coronal Jets
• Observation of kink waves in solar spicules
• Flux emergence and coronal eruption
• Multiple Plasmoid Ejections and Associated Hard X-ray Bursts in the 2000 November 24 Flare
• Triggering Mechanism for the Filament Eruption on 2005 September 13 in Active Region NOAA 10808
• Propagation of sausage soliton in the solar lower atmosphere observed by Hinode/SOT
• Observational signatures of the coronal kink instability with thermal conduction

Cited by in corpus (5)

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• Coronal microjets in quiet-Sun regions observed with the Extreme Ultraviolet Imager onboard Solar Orbiter
• Origin of Macrospicule and Jet in Polar Corona by A Small-scale Kinked Flux-Tube
• Eruption of a plasma blob, associated M-class flare, and large-scale EUV wave observed by SDO
• Magnetic diffusion driven shear instability of solar flux tubes