A. Mishev, I.Usoskin, S. Tuohino & A. Ibragimov The upgraded GLE database includes assessment of radiation exposure at flight altitudes A. Mishev, I.Usoskin, S. Tuohino & A. Ibragimov University of Oulu alexander.mishev@oulu.fi

Outline 1. Introduction 2. Model for computation of effective and/or ambient doe equivalent at flihgt altitudes 3. Examples 4. Application(s) 5. Summary

3 Introduction An important topic of solar physics, space weather, atmospheric physics is the assessment Primary SEP parameters: energy spectrum anisotropy using the information from NMs

GLE definition A GLE event is registered when there are near-time coincident and statistically significant enhancements of the count rates of at least two differently located neutron monitors including at least one neutron monitor near sea level and a corresponding enhancement in the proton flux measured by a space-borne instrument(s). Poluianov et at. Sol. Phys. 2017

Global neutron monitor network

Model for computation of effective dose rate at aviation altitudes Yield function For GCRs

For the GCRs spectrum – force field model 1. Data mostly based on NM data analysis, when available 2. The computations are performed for various reconstructions of SEP spectra, available in literature, thus for some events there are several results 3. An conservative isotropic distribution of SEPs is considered

Comparison with measurements and models

Rigidity spectrum and PAD during GLE 70, 13 December 2006

Examples

GLE 08 cont.

GLE 70, 13 December 2006

GLE 70 cont.

SUMMARY A new database for assessment of radiation doses at flight altitude related GLEs is created under VarSiTi/SCOSTEP support and incorporated to the International GLE database (gle.oulu.fi). The upgraded database provides, for each GLE event, where possible, information on the estimated energy/rigidity spectra of SEPsand the corresponding computed effective doses at cruise flight altitude of 35 kft The computations are performed for various reconstructions of solar energetic particles spectra, available in literature, thus for some events there are several results. 4. The maximum effective dose rates at the aviation altitude of 35 kft is computed. 5. A highly significant correlation between the maximum effective dose rate and the NM count rate increase was found – proxy for exposure assessment.

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