Advanced Composition Explorer (ACE) Solar Energetic Particle Charge Analyser (SEPICA) Level 2 Data

The Solar Energetic Particle Charge Analyser (SEPICA) is used to
determine the charge state distribution of energetic particle
distributions. SEPICA is designed to measure the ionic charge state,
Q, the kinetic energy, E, and the nuclear charge, Z, of energetic ions
above 0.2 MeV/Nuc. This includes ions accelerated in solar flares as
well as in interplanetary space during energetic storm particle (ESP)
and co-rotating interaction region (CIR) events. For low mass numbers
SEPICA will also separate isotopes -- for example, 3He and 4He. During
solar quiet times, SEPICA should also be able to directly measure the
charge states of anomalous cosmic ray nuclei, including H, N, O, and
Ne, which are presumed to be singly-charged. With the capability to
differentiate the charge states of ions, the instrument will also be
able to separate neutral atoms (Q = 0) from ions. Thus it may be able
to identify energetic neutrals created through charge exchange.

SEPICA level 2 data is organized into 27-day time periods (Bartels
Rotations - roughly one solar rotation period). For each Bartels
Rotation, the level 2 data contains time averages of solar energetic
particle fluxes over the following time periods:

- 120-second (H and He only)
- hourly
- (all elements) daily
- (all elements) 27 days (1 Bartels rotation) (all elements)

Currently, spin-averaged flux data are available for 8 elements, in
units of particles/(cm2*Sr*sec*MeV/nucleon), in a number of energy
ranges. The energy ranges are different for each element. The elements
for which data are available are:

- H, He, C, O, Ne, Mg, Si and Fe.

See:
http://www.srl.caltech.edu/ACE/ASC/level2/sepica_l2desc.html