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

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.