High Energy Particle Environment: Analysis of Large SEP Events
This content explores the high-energy particle environment during large solar energetic particle (SEP) events, focusing on spectral slopes, fluence measurement intervals, and parameter variability. Spectral slopes are examined below the rollover energy, showcasing significant variability at both low and high energies. The analysis includes a study on the average spectrum of parameters in GLE samples and plans for further analysis on SEP events with varying energy ranges.
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Presentation Transcript
HIGH ENERGY PARTICLE ENVIRONMENT M. Laurenza
Particle environment during large SEP events Selection of the largest events during solar cycle n 23 (1997 2009) extending to very high energies (ground level enhancements - GLEs) ACE/EPAM and GOES/SEM data Energy range 0.1 100 MeV
Broken power law: a and bdetermine the spectral slope at energies lower and higher of the rollover energy E0, respectively.
Fluence measurement intervals 11/06/1997: 13:00 on 11/06 - 24:00 on 11/10 04/20/1998: 11:00 on 04/20 - 24:00 on 4/25 09/30/1998: 14:00 on 09/30 - 24:00 on 10/3 07/14/2000: 10:00 on 07/14 - 00:00 on 07/20 11/08/2000: 23:00 on 11/08 - 24:00 on 11/13 04/02/2001: 11:00 on 04/02 - 10:00 on 4/7 04/10/2001: 08:00 on 04/10 - 24:00 on 4/13 04/15/2001: 14:00 on 04/15 - 03:00 on 4/18 04/18/2001: 03:00 on 04/18 - 24:00 on 4/21 04/21/2002: 01:00 on 04/21 - 24:00 on 4/26 11/09/2002: 14:00 on 11/09 - 24:00 on 11/13 10/26/2003: 17:21 on 10/26 - 10:00 on 10/28 10/28/2003: 11:00 on 10/28 - 20:00 on 10/29 10/29/2003: 20:37 on 10/29 - 24:00 on 10/31 11/02/2003: 17:03 on 11/02 - 20:00 on 11/04 11/04/2003: 19:29 on 11/04 - 12:00 on 11/07 01/20/2005: 06:36 on 01/20 - 19:00 on 01/21 - - Blue lines indicate the worst and lowest case Spectral slopes are similar below the rollover energy are similar Variability of at least two order of magnitude both at low and high energy - Two caveats: - The flux can be higher at low energy (because fluence is computed over times onset/end at high energy) - The flux could be higher at all energies because most events were not finished when another one occurred.
Parameter Variability (GLE sample) Average spectrum: mean for each parameter, after verifying they are not mutually correlated. Cm= 2.57*108 am = -1.24 b = -3.35 Same analysis will be performed on more SEP events, e.g., those containing only low energies (wider sample).
