Revised View of Solar X-Ray Jets

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• Dr. Alphonse Sterling (University of Alabama)
• Tuesday 26 May 2015, 13:00-14:00
• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Andrew Hillier.

We investigate the onset of <sub>20 random X-ray jets observed by Hinode/XRT. Each jet was near the limb in a polar coronal hole, and showed a ``bright point’’ in an edge of the base of the jet, as is typical for previously-observed X-ray jets. We examined SDO /AIA EUV images of each of the jets over multiple AIA channels, including 304 Å, which detects chromospheric emissions, and 171, 193, and 211 Å, which detect cooler-coronal emissions. We find the jets to result from eruptions of miniature (size <</sub>10 arcsec) filaments from the bases of the jets. Much of the erupting-filament material forms a chromospheric-temperature jet. In the cool-coronal channels, often the filament appears in absorption and the hotter EUV component of the jet appears in emission. The jet bright point forms at the location from which the miniature filament erupts, analogous to the formation of a standard solar flare arcade via flare (``internal’‘) reconnection in the wake of the eruption of a typical larger-scale chromospheric filament. The spire of the jet forms on open field lines that presumably have undergone interchange (``external’‘) reconnection with the erupting field that envelops and carries the miniature filament. This is consistent with what we found for the onset of an on-disk coronal jet we examined in Adams et al. (2014), and the observations of other workers. It is however not consistent with the basic version of the “emerging-flux model” for X-ray jets. This work was supported by funding from NASA /LWS, Hinode, and ISSI .

This talk is part of the DAMTP Astro Lunch series.

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