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

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.

Data and Resources

Additional Info

Field Value
Maintainer JAMES JOHNSON
Last Updated February 19, 2025, 11:18 (UTC)
Created February 19, 2025, 11:18 (UTC)
accessLevel public
bureauCode {026:00}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://data.nasa.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
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). https://disc.gsfc.nasa.gov/datacollection/UARPE3AT_004.html. Digital Science Data.
creator Winningham, David J., et al.
data-presentation-form Digital Science Data
graphic-preview-file https://docserver.gesdisc.eosdis.nasa.gov/public/project/Images/UARPE3AT_004.png
harvest_object_id a09ebebf-f233-46c3-b833-f4153a1dcc5b
harvest_source_id b37e5849-07d2-41cd-8bb6-c6e83fc98f2d
harvest_source_title DNG Legacy Data
identifier C1273348591-GES_DISC
issued 1997-06-03
landingPage https://cmr.earthdata.nasa.gov:443/search/concepts/C1273348591-GES_DISC.html
language {en-US}
metadata_type geospatial
modified 1997-06-03
programCode {026:001}
publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
release-place Greenbelt, MD, USA
resource-type Dataset
series-name UARPE3AT
source_datajson_identifier true
source_hash d30603baacbe79c0bb6ea262b9f27c3677b7dc7cb4b93710edd820ec3150e597
source_schema_version 1.1
spatial -180.0 -80.0 180.0 80.0
temporal 1991-10-01T00:00:00Z/1999-12-31T23:59:59.999Z
theme {UARS,geospatial}