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The most recent Voyager 6-hour averages for the LA1 (> 0.5 MeV/nuc nuclei) and PGH (> 70 MeV/nuc nuclei) rates are shown below in selectable thumbnail images.

The LA1 rate consists of greater than 0.5 MeV/nuc nuclei, principally protons, and is sensitive to low-energy phenomena in interplanetary space (e.g., co-rotating interaction regions, associated enhancements and solar flares).

The PGH rate consists of greater than 70 MeV/nuc nuclei, primarily protons, and is a good indicator of the level of modulation of galactic cosmic rays. It can also respond to large solar flares.


NOTE: The drop in the Voyager 1 LA1 rate data shown in the figure below is temperature related due to the turn-off of the CRS heater.

The Voyager 2 heater was turned off in mid 2019. Corrections have been applied to the Voyager 2 flux data from DOY 178/2019 (June 27). Flux data from DOY 160/2019 to DOY 178/2019 (June 9 - 26) is not available.

See Voyager-2 Temperature Corrections for additional information.

The Rate data has not been corrected so please use caution using V1 Rate data after DOY 138/2022 and V2 Rate data after DOY 159/2019 (June 8).


Voyager-1 3-Month >0.5 MeV/n Ions Rate Gif
Voyager-1 LA1 Rate
Voyager-1 3-Month >70 MeV/n Ions Rate Gif
Voyager-1 PGH Rate (HET 1)
Voyager-2 3-Month >0.5 MeV/n Ions Rate Gif
Voyager-2 LA1 Rate
Voyager-2 3-Month >70 MeV/n Ions Rate Gif
Voyager-2 PGH Rate (HET 1)


Through the Rate, Flux and Spectra User Interfaces you may generate figures and download CRS data for the lifetime of the Voyager mission. These interfaces have been tested with Microsoft Edge, Chrome and Firefox browsers.


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Last Updated: 11/18/2005