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Article overview
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Energy release from a stream of infalling prominence debris on 2011 September 7-8 | | Andrew R. Inglis
; Holly R. Gilbert
; Leon Ofman
; | | Date: |
4 Aug 2017 | | Abstract: | In recent years high-resolution and high-cadence EUV imaging has revealed a
new phenomenon, impacting prominence debris, where prominence material from
failed or partial eruptions can impact the lower atmosphere and release energy.
We report a clear example of energy release and EUV brightening due to
infalling prominence debris that occurred on 2011 September 7-8. The initial
eruption of prominence material was associated with an X1.8-class flare from
AR11283, occurring at 22:30 UT on 2011 September 7. Subsequently, a
semi-continuous stream of this material was observed to return to the solar
surface with a velocity v > 150 km/s, impacting a region remote from the
original active region between 00:20 - 00:40 UT on 2011 September 8. Using
SDO/AIA, the differential emission measure of the plasma was estimated
throughout this brightening event. We found that the radiated energy of the
impacted plasma was L ~ 10^27 ergs, while the thermal energy peaked at ~ 10^28
ergs. From this we were able to determine the mass content of the debris to be
in the range 2x10^14 < m < 2x10^15 g. Given typical prominence masses, the
likely debris mass is towards the lower end of this range. This clear example
of a prominence debris event shows that significant energy release takes place
during these events, and that such impacts may be used as a novel diagnostic
tool for investigating prominence material properties. | | Source: | arXiv, 1708.1555 | | Services: | Forum | Review | PDF | Favorites | |
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