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

• Main Author: Omerbashich, M.
• Format: Report
• Language: English
• Published: 2021
• Subjects: Beryllium analysis; Vostok ice cores; cosmic rays; paleoclimate; Hallstadzeit cycle; LaViolette flares; High energy astrophysics; Gamma-ray bursts; Rapid bursts; Supernovae; Gamma-ray sources; Gamma-ray transient sources; Soft gamma-ray repeaters; Galactic center; Milky Way Galaxy physics; Magnetars; Milky Way magnetic fields; Sky surveys; Surface ices; Cosmochemistry; Cosmic abundances; Chemical abundances; Frozen-in elements; Time series analysis; Period search; Gauss-Vaniček spectral analysis; Milky Way; Taylor Dome; Antarc*; Antarctica; ice core
• Online Access: https://zenodo.org/record/5228497; https://doi.org/10.5281/zenodo.5228497

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 galactic source. Based on 500-parsec Galactic Center (GC) GeV/TeV γ-ray surveys by the H.E.S.S. and INTEGRAL telescopes, the GC’s extremely active central region makes the best candidate-host for such bursts recently observed by ROSAT and Fermi satellites. I estimate the most recent epoch of 10Be maximum as 1085±57 CE, coinciding with the 1054–1056 CE historical account apparently of SN1054 (Crab supernova), and predict the next maximum 10Be in 4463±57 CE. Given continuous decadeslong exposure and the relatively short return period coinciding with known cataclysms, this recurrent LaViolette flare affects the Earth climate significantly.