29 July 2015 to 6 August 2015
World Forum
Europe/Amsterdam timezone

Unseen GLEs (Ground Level Events)

30 Jul 2015, 12:15
15m
Mississippi (World Forum)

Mississippi

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution SH-EX Parallel SH 01 SEP I

Speaker

Eric Christian (NASA/GSFC)

Description

Over the last seventy years, solar energetic particle (SEP) ground level events (GLEs) have been observed by ground-based neutron monitors and muon telescopes at a rate of slightly more than one per year. Ground-based detectors only measure secondary particles, and matching their observations with SEP in-situ measurements at lower energies from spacecraft has been difficult. Now, the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) instrument provides in-situ measurements that also include composition and pitch-angle distribution and bridge the energy between long-term SEP monitors in space (e.g. ACE and GOES) and the ground-based observations. The PAMELA data show that there are some SEP events (e.g. 23 Jan 2012) where PAMELA sees high-energy (> 1 GeV) particles, yet these are not registered as GLEs. The PAMELA observations indicate that it is possible for the anisotropic distribution of the highest energy SEPs to miss the global network of neutron monitors.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 923

Primary author

Eric Christian (NASA/GSFC)

Co-authors

Alessandro Bruno (Bari University, Italy) Emiliano Mocchiutti (INFN (Trieste)) Dr Georgia de Noflo (NASA/GSFC Code 672) James Ryan (University of New Hampshire) Marco Ricci (Istituto Nazionale Fisica Nucleare Frascati (IT)) Matteo Martucci (Università di Roma Tor Vergata) Matteo Merge (INFN (Rome)) Mirko Boezio (Universita e INFN (IT)) Riccardo Munini (INFN - Universita Studi Trieste) Steve Stochaj (New Mexico State University) Ulisse Bravar (University of New Hampshire)

Presentation Materials

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