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UARS Particle Environment Monitor (PEM) Level 3AT V004 (UARPE3AT) at GES DISC

Metadata Updated: December 7, 2023

The Particle Environment Monitor (PEM) Level 3AT data product consists of daily, 65.536 second interval time-ordered, vertical profiles of electron, proton and x-ray energy deposition rates. PEM was made up of four instruments: the Atmospheric X-Ray Imaging Spectrometer (AXIS), the High Energy Particle Spectrometer (HEPS), the Medium Energy Spectrometer (MEPS), and the Vector Magnetometer (VMAG). PEM was flown on NASA's Upper Atmosphere Research Satellite (UARS) to measure the type, amount, energy, and distribution of charged particles injected into the Earth's thermosphere, mesosphere, and stratosphere. The PEM electron and proton data are processed with the version 4 algorithm, while the x-ray data remained version 3.

The PEM level 3AT data consist of 18 granules per day. A data granule is defined as one PEM subtype per day. The x-ray pixel subtypes are grouped together in a single tar file for each day, the electron and proton are available as individual files per day.

Data are on the UARS standard altitude levels (in km) given by:

z(i) = 5 * i, i <= 12 z(i) = 60 + (i - 12) * 3, 13 <= i <= 32 z(i) = 120 + (i - 32) * 10, 33 <= i <= 50

The data files are available in a binary record oriented format.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023

Metadata Source

Harvested from NASA Data.json

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Additional Metadata

Resource Type Dataset
Metadata Created Date November 12, 2020
Metadata Updated Date December 7, 2023
Identifier C1273348591-GES_DISC
Data First Published 1997-06-03
Language en-US
Data Last Modified 1997-06-03
Category UARS, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation Winningham, David J., et al.. 1998-04-26. UARPE3AT. Version 004. UARS Particle Environment Monitor (PEM) Level 3AT V004. Greenbelt, MD, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). Digital Science Data.
Creator Winningham, David J., et al.
Data Presentation Form Digital Science Data
Graphic Preview File
Harvest Object Id 5b39b0ab-c2ad-4662-880b-a7f9b5fd58eb
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -80.0 180.0 80.0
Program Code 026:001
Release Place Greenbelt, MD, USA
Series Name UARPE3AT
Source Datajson Identifier True
Source Hash d30603baacbe79c0bb6ea262b9f27c3677b7dc7cb4b93710edd820ec3150e597
Source Schema Version 1.1
Temporal 1991-10-01T00:00:00Z/1999-12-31T23:59:59.999Z

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