Solar energetic particles, or SEPs, from suprathermal (few keV) up to relativistic (∼∼ few
GeV) energies are accelerated near the Sun in at least two ways:(1) by magnetic …

Abstract One century ago Viktor Hess carried out several balloon flights that led him to
conclude that the penetrating radiation responsible for the discharge of electroscopes was of …

Abstract The Integrated Science Investigation of the Sun (ISIS) is a complete science
investigation on the Solar Probe Plus (SPP) mission, which flies to within nine solar radii of …

Above a few tens of MeV per nucleon, large, gradual solar energetic particle (SEP) events
are highly variable in their spectral characteristics and elemental composition. The origin of …

The complex interaction between shocks and plasma turbulence is extremely important to
address crucial features of energy conversion in a broad range of astrophysical systems. We …

We consider the effect of preexisting, large-scale, broadband turbulent density fluctuations
on propagating hydromagnetic shock waves. We present results from several numerical …

The subject of this paper is stochastic acceleration by plasma turbulence, a process akin to
the original model proposed by Fermi. We review the relative merits of different acceleration …

We present a review of Anomalous Cosmic Rays (ACRs), including the history of their
discovery and recent insights into their acceleration and transport in the heliosphere. We …

We report spacecraft measurements of the energy spectra of solar protons and other solar
energetic particle properties during the 16 Ground Level Events (GLEs) of Solar Cycle 23 …

Energetic particles represent an important component of the plasma in the heliosphere.
They range from particles accelerated at impulsive events in the solar corona and at large …