Alexander Mishev and Ilya Usoskin

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Presentation transcript:

Alexander Mishev and Ilya Usoskin Using global neutron monitor network data for GLE analysis: recent results Alexander Mishev and Ilya Usoskin University of Oulu alexander.mishev@oulu.fi

Outline 1. Introduction & Motivation 2. NM yield function, method for GLE analysis 3. sub-GLE analysis 4. Examples 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

Global neutron monitor network

Method for GLE analysis The NM count rate modeling NM yield function NM rel. increase

New NM yield function Mishev, Usoskin & Kovaltsov JGR,2013, 118, 2783-2788

The GLE analysis procedure 1. Definition of asymptotic viewing cones and Pc of the NM stations: Computation of particle trajectory in a model magnetosphere. 2. making an initial guess of the inverse problem 3. Application of a optimization procedure (inverse method) primary solar proton parameters: (energy spectrum, anisotropy axis direction, pitch-angle distribution)

Modified power law or exponent PAD – Gaussian like From 5 Up to 14 parameters

Inverse, constrained nonlinear problem Levenberg Marquardt algorithm using MINPACK

Rigidity spectrum and PAD during GLE 70, 13 December 2006

GLE 70 – 13.12. 2006

GLE 70 – 13.12. 2006

Contour plot for best fit solution vs Contour plot for best fit solution vs. geo latitude and longitude (18:00 UT)

Asymptotic viewing directions during GLE 67, 2 November 2003

Rigidity spectra during GLE 67, 3 November 2003 Initial & main phase 17:30—17:55 Late phase 18:00—18:30

PAD during GLE 67, 3 November 2003

Rigidity spectra during GLE 71, 17 May 2012

PAD during GLE 71, 17 May 2012

Sub-GLE event of 29 October 2015 contour plot

Derived family of spectra and PAD sub-GLE 29 October 2015

Conclusion 1. New NM yield function 2. Method for GLE analysis based on NM data 3. Method for sub-GLE analysis based on NM data

THANK YOU