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Voyager 2 LECP - Daily Average Interplanetary Data

Metadata Updated: March 13, 2026

This data file contains 1 day averages of count rates for 11 energetic ion channels from the Low Energy Charged Particle (LECP) instrument on Voyager 2. The data listed are averaged over 24 hours, with the start time of the averging interval begining at the start of the day listed. For \n example, 77/300 is an average over hours 0-23 on day 300 of 1977. Times are given in SCET-UT. The count rates R are in counts per second. The statistical uncertainty for each channel is the inverse square root of the total number of counts during each 24 hour period times the average count rate R. Included in the data table are the passbands in KeV for protons, the logarithmic mean energy Em for the differential energy channels, the geometric factor "g" (cm2-steradian), and the flux conversion factor "f". To get from count rate R to differential in energy flux "dj(E)/dE", multiply R by f, \n i.e., \n dj(E)/dE=fR. \n\n Note that f is simply the inverse of the energy passband multiplied by\n the geometric factor. Generally one uses a more elaborate algorithm to \n calculate fluxes by determining the local slope of the energy spectrum within \n each energy passband, usually by an iterative algorithm, and then evaluating \n the flux corresponding to each channel using this slope. However, if the \n slope of the energy spectrum is not to steep, the approximation dj(E)/dE=fR \n is very good if the flux is evaluated at the mean energy Em=Sqrt(EL*EH),\n where EL and EH are the low and high energy ends of the passband. Since the \n slopes of low energy ion spectra in the interplanetary medium are in the\n range of -1 to -3, the approximation is very good.\n

Access & Use Information

Public: This dataset is intended for public access and use. License: See this page for license information.

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Dates

Metadata Created Date March 13, 2026
Metadata Updated Date March 13, 2026

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date March 13, 2026
Metadata Updated Date March 13, 2026
Publisher NASA Space Physics Data Facility (SPDF) Data Services
Maintainer
Identifier /SDE/SPASE_JSON/|f4d85a67404e40771740f914d30cad06
Data Last Modified 2026-03-09
Category Heliophysics
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 66bfa239-91ca-4c30-82d7-3b3aa321065e
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
License https://www.usa.gov/government-works
Program Code 026:000
Source Datajson Identifier True
Source Hash b4a3a36553ee68b4052e0700024d43a9f8a52d2581e85c3440d7e32a891be063
Source Schema Version 1.1

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