1. Application of neutron monitor data for space weather
A. Mishev & I. Usoskin
ReSolve, University of Oulu, Finland

2. MODEL

3. A full chain analysis of GLE using NM data
Derivation of energy spectrum, anisotropy axis direction, pitch-angle distribution
on the basis of NM response modeling (inverse problem solution)
Application of a new model for effective/ambient dose equivalent estimation based on a full Monte Carlo simulation of SEP and GCR propagation and interaction with the atmospheric molecules (yield function formalism) using the derived SEP spectra and PAD from step 1.
Exposure of air crew at flight altitudes of 35 & 50 kft

4. The GLE analysis procedure
1. Definition of asymptotic viewing cones & rigidity cut-offs of the NM stations:
Computation of particle trajectory in a model magnetosphere.
2. Calculation of the NM responses: initial guess of the inverse problem
3. Application of a least square procedure (inverse method)
primary solar proton parameters:
(energy spectrum, anisotropy axis direction, pitch-angle distribution)

5. The NM count rate modeling
Y is the NM yield function, J is the primary CR rigidity spectrum
A is the effective detector area, F is the secondary CR particle flux at given altitude

6. Modified power law or exponent
PAD – Gaussian like
From 5 Up to 14 parameters
Express method 3 parameters

7. Rigidity spectrum and PAD during GLE 70, 13 December 2006

8. Effective dose yield function
Y is the effective or ambient dose equivalent yield function,
J is the primary CR rigidity spectrum
F secondary CR particle flux
C conversion coefficients flux to dose

9. Effective dose, ambient dose equivalent and reference data at 35 kft a
Effective dose, ambient dose equivalent and reference data at 35 kft a.s.l.

12. THANK YOU