Searching for rapid pulsations in solar flare X-ray data
Andrew R. Inglis, Laura A. Hayes

TL;DR
This study systematically searches for short-period quasi-periodic pulsations in solar flare X-ray data from Fermi/GBM, finding limited evidence for their widespread occurrence and highlighting the challenges in detecting such signals.
Contribution
It is the first comprehensive analysis of short-period pulsations in high-cadence Fermi/GBM solar flare data, including synthetic lightcurve testing to evaluate detection reliability.
Findings
Limited evidence for widespread short-period pulsations.
Detection likelihood is low due to signal-to-noise constraints.
Identified candidate events for further investigation.
Abstract
Most studies of quasi-periodic pulsations in solar flares have identified characteristic periods in the 5 - 300s range. Due to observational limitations there have been few attempts to probe the < 5s period regime and understand the prevalence of such short-period quasi-periodic pulsations. However, the Fermi Gamma-ray Burst Monitor (GBM) has observed approximately 1500 solar flares to date in high cadence 16 Hz burst mode, providing us with an opportunity to study short-period quasi-periodic pulsations at X-ray energies. We systematically analyse every solar flare observed by Fermi/GBM in burst mode, estimating the prevalence of quasi-periodic pulsations in multiple X-ray energy bands. To better understand these results, we complement this with analysis of synthetic solar flare lightcurves, both with and without oscillatory signals present. Using these synthetic lightcurves, we can…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Geophysics and Gravity Measurements
