This website presents flux averages from the Low Energy Charged Particle
instruments on Voyager 1 and Voyager 2. The PHA data
(pulse height analysis)
from the LECP instruments
have been analyzed to compute 26-day, 52-day, and
annual flux averages
for several species as a function of energy.
All data returned in the Cruise 5a format are included. The covered time periods
are Day 228, 1990 to the present (V1) and DOY 156, 1990 to the present (V2)
. No planetary flybys
are included. Plots are updated automatically when new LECP MRT data appear on the
JHU/APL LECP server. This occurs approximately weekly.
Two types of plots are available: time-intensity plots
and spectra plots
are shown for H, He, C, and O
energy ranges near 1 MeV/nuc, 6 MeV/nuc, and 25 MeV/nuc
. Click on the
Time-Intensity links in the navigation menu on the left side of this page to view
thumbnail plots of all species for both V1 and V2. The 1-Day Averages contain
a subset of the species and energies available in the 26-Day Averages.
Click on the thumbnail to obtain a larger plot. From that page you may choose plots
of 52-day or annual averages, or zoom in on data from 2000 to the present. The
Heliopause Crossings page has daily averages of GCRs (> 213 MeV) and lower energy
protons, helium and oxygen for Voyager 1 and 2 around the time they crossed the
are selected by spacecraft, averaging interval
in the navigation menu.
The Master Database Files
section in the navigation menu contains links to the
ascii data files used to make the plots. You can view the data in your browser
or download gzipped versions of the files.
Data quality warning
: In order to automate these mission plots, no background
corrections are made
. There are known issues for some of the species at some
energies. Energy intervals were chosen for the time-intensity plots for which
background corrections are thought to be small in most cases. Users of the data
should be in contact with knowledgeable LECP team members.
This Voyager LECP website is maintained by the
University of Maryland Space Physics Group
Scientific contact: Douglas C. Hamilton
Software maintenance: Scott Lasley