Great Solar Energetic Particle Events: Monitoring and Forecasting of Radiation Hazard by Using On-line One-min Neutron Monitor Data

Details Great Solar Energetic Particle Events: Monitoring and Forecasting of Radiation Hazard by Using On-line One-min Neutron Monitor Data Great Solar Energetic Particle Events: Monitoring and Forecasting of Radiation Hazard by Using On-line One-min Neutron Monitor Data

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...1e..56d&link_type=abstract

Cosmic Particle Acceleration, 26th meeting of the IAU, Joint Discussion 1, 16-17 August, 2006, Prague, Czech Republic, JD01, #56

Physics

Scientific paper

We show that monitoring and exact forecast of the radiation hazard from great Solar Energetic Particle (SEP) events for aircrafts can be made by using high-energy particles (few GeV/nucleon and higher) which transportation from the Sun is characterized by much bigger diffusion coefficient than for small and middle energy particles. Therefore high energy particles came from the Sun much more early (8-20 minutes after acceleration and escaping into solar wind) than main part of smaller energy particles caused dangerous situation for electronics and for crew and passengers health (more than 30-60 minutes later). We describe here principles and experience of automatically working of program "SEP-Search" for determining of the start of SEP. We determine also the probabilities of false and missed alerts. From the first minutes of SEP beginning automatically starts to work on line the program "SEP-Research" for determining SEP energy spectrum, time of ejection, effective diffusion coefficient, and then expected time variation of SEP intensity and expected radiation hazard inside aircrafts in dependence of altitude, cutoff rigidity, and shielding.

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