Signature of 3600-yr LaViolette flare in Antarctica 10Be spectra ...

• Main Author: Omerbashich, M.
• Format: Report
• Language: English
• Published: Zenodo 2021
• Subjects: Beryllium analysis; Vostok ice cores; cosmic rays; paleoclimate; Hallstadzeit cycle; LaViolette flares; Antarc*; Antarctica; ice core
• Online Access: https://dx.doi.org/10.5281/zenodo.5228496; https://zenodo.org/doi/10.5281/zenodo.5228496

10Be deposition rates from Vostok, Antarctica raw ice core records are periodic with 3592±57 yr at 99% significance, verified against the 10Be concentration raw data from both Vostok, as 3700±57 yr at 99%, and Taylor Dome, Antarctica, as 3800±61 yr at 99%. Also, Mg concentration data from Taylor Dome cycle every 3965±16 yr at 99%. The Vostok data respond to the Hallstadzeit Solar cycle, as 2296±57 yr at 99%, perhaps its best estimate yet. After data separation at 2·105 atoms/cm2/yr (deposition rates) and 0.95·105 atoms/g of ice (concentrations) cutoffs, reflecting cosmic-ray background conditions at the Galactic boundary, only the discovered period remains and converges, as 3378±103 yr and 3346±85 yr, respectively; the Hallstadzeit cycle vanishes in both cases. Thus the observed ~3600-yr period is of extrasolar but galactic origin. Since 10Be periodicity is explainable only by rapid excesses in the atmospheric cosmic-ray influx, the discovered period is the signature of a regular burst occurrence from a ...