Submerged Flare Acoustic Sources: Difference between revisions
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[https://solarscience.msfc.nasa.gov/Helioseismology.shtml "p-mode" global oscillations]. | [https://solarscience.msfc.nasa.gov/Helioseismology.shtml "p-mode" global oscillations]. | ||
Recently an extraordinarily impulsive flare, | Recently an extraordinarily impulsive flare, SOL2011-07-23, produced | ||
an acoustic event that has led to the discovery described here (Ref. [2]). | an acoustic event that has led to the discovery described here (Ref. [2]). | ||
Revision as of 16:37, 28 September 2020
| Nugget | |
|---|---|
| Number: | 388 |
| 1st Author: | Charles LINDSEY |
| 2nd Author: | Angel MARTÍNEZ |
| Published: | 13 September 2020 |
| Next Nugget: | TBD |
| Previous Nugget: | Circular Ribbon Flare at Microwaves |
Introduction
A major new discovery about solar flares appeared as recently as 1997, when a set of concentric, expanding ripples appeared on the solar surface immediately following the flare SOL1996-07-09 (see earlier Nuggets No. 26 and No. 127). These phenomena hold great interest because they come from acoustic waves launched by the flare that surprisingly penetrate into the Sun's deep interior, and that contain substantial fractions of the flare's total energy. At present no broadly accepted theory exists.
These events are hard to detect because the ripples have small amplitudes, comparable in fact to the ubiquitous photospheric variability due to convection and the "p-mode" global oscillations. Recently an extraordinarily impulsive flare, SOL2011-07-23, produced an acoustic event that has led to the discovery described here (Ref. [2]).