White-light Continuum Observation of the Off-limb Loops of the SOL2017-09-10 X8.2 Flare: Temporal and Spatial Variations
arXiv:2110.14130 · doi:10.3847/2041-8213/ac3339
Abstract
Observations of the Sun's off-limb white-light (WL) flares offer rare opportunities to study the energy release and transport mechanisms in flare loops. One of the best such events was SOL2017-09-10, an X8.2 flare that occurred near the Sun's west limb on 2017 September 10 and produced a WL loop system lasting more than 60 minutes and reaching an altitude higher than 30 Mm. The event was well observed by a suite of ground- and space-based instruments, including the Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) that captured its off-limb loops in WL continuum near Fe I 6173 A, and the Atmospheric Imager Assembly (SDO/AIA) that observed its ultraviolet (UV) and extreme-ultraviolet (EUV) counterparts. We found quasi-periodic pulsations in the WL and UV emissions at the flare loop-top with a period around 8.0 min. Each pulsation appears to have an EUV counterpart that occurs earlier in time and higher in altitude. Despite many similarities in the WL and UV images and light curves, the WL flux at the loop-top continues to grow for about 16 minutes while the UV fluxes gradually decay. We discuss the implication of these unprecedented observations on the understanding of the enigmatic off-limb WL flare emission mechanisms.
arXiv commentAccepted for publication in ApJ Letters
References in corpus (19)
- Microwave and Hard X-Ray Observations of the 2017 September 10 Solar Limb Flare
- Plasmoid Ejections and Loop Contractions in an Eruptive M7.7 Solar Flare: Evidence of Particle Acceleration and Heating in Magnetic Reconnection Outflows
- Global Properties of Solar Flares
- Spectroscopic Observations of Current Sheet Formation and Evolution
- Quasi-periodic pulsations in solar and stellar flares: an overview of recent results
- Global sausage oscillation of solar flare loops detected by the Interface Region Imaging Spectrograph
- Quantitative Examination of a Large Sample of Supra-Arcade Downflows in Eruptive Solar Flares
- Mapping the magnetic field of flare coronal loops
- Persistent Quasi-Periodic Pulsations During a Large X-Class Solar Flare
- Magnetic Reconnection During the Post-Impulsive Phase of a Long-Duration Solar Flare: Bi-Directional Outflows as a Cause of Microwave and X-ray Bursts
- RHESSI Observations of a Simple Large X-ray Flare on 11-03-2003
- Hot Plasma Flows and Oscillations in the Loop-top Region During the September 10 2017 X8.2 Solar Flare
- Detection and Interpretation Of Long-Lived X-Ray Quasi-Periodic Pulsations in the X-Class Solar Flare On 2013 May 14
- A Compact Source for Quasi-Periodic Pulsation in an M-class Solar Flare
- On the nature of off-limb flare continuum sources detected by SDO/HMI
- High-Density Off-Limb Flare Loops Observed by SDO
- Chromospheric and Coronal Observations of Solar Flares with the Helioseismic and Magnetic Imager
- Helioseismic and Magnetic Imager observations of linear polarization from a loop prominence system
- Signatures of Helium continuum in cool flare loops observed by SDO/AIA