Title: Cosmic Rays and Space Weather, 2. On-line Determination of Flare Energetic Particle Spectrum
Author: L.I. Dorman
Affil: Israel Cosmic Ray Center and Emilio Segre' Observatory, affiliated to Tel Aviv University, Technion and Israel Space Agency, Israel
Email: lid@physics.technion.ac.il, lid1@ccsg.tau.ac.il
Authors: M. Murat (3), L.A. Pustil'nik (1), A. Sternlieb (1), I.G. Zukerman (1)
Affils: IZMIRAN, Russian Academy of Science, Troitsk, Moscow region, Russia; (3) SOREQ, Israel
Abstract: In paper Dorman et al. (2001) was described how works automatically the program "FEP-Search", determined on the basis of on-line one-minute NM data the beginning of great FEP event.
The next one-minute data the program "FEP-Search" uses for checking that the observed increase reflects the beginning of real great FEP or not.
If yes, automatically starts to work on line the program "FEP-Research/Spectrum". We consider two variants: 1) quiet
period (no change in cut-off rigidity), 2) disturbed period (characterized with possible changing of cut-off rigidity).
We describe the method of determining of the spectrum of FEP in the 1-st variant (for this we need data for
at least two components with different coupling functions). For the 2-nd
variant we need data for at least three components with different coupling functions. We show
that for these purposes can be used data of total intensity and some different multiplicities, but better to use data from two
or three NM with different cut-off rigidities. We describe in details the algorithms of
the program "FEP-Research/Spectrum". We show how worked this program
on examples of some historical great FEP events.
REFERENCES: Dorman L.I. et al., 2001. "Cosmic rays and space weather, 1. On-line search of the start of great flare energetic particle event ", submitted to SCOSTEP'S 10th Quadrennial Symposium (June 2001).