UARPE2VMAGAC_001

UARS PEM Level 2 VMAG AC V001 (UARPE2VMAGAC) at GES DISC

Version 001 eng
  • Abstract
    The Particle Environment Monitor (PEM) level 2 Vector Magnetometer (VMAG) AC daily product contains the Vector Magnetic Field AC component. PEM was flown on the UARS spacecraft to measure the type, amount, energy, and distribution of charged particles injected into the Earth's thermosphere, mesosphere, and stratosphere.The VMAG DC magnetic field measurements are limited to frequencies less than 2.5 Hz by an 18 db/octave antialiasing filter. Higher frequencies are measured with a peak detector and are the Vector Magnetic Field AC component. The AC value is derived from each vector field component where the sensor output is pass band filtered from 2.5 to 50 Hz. The resultant signal is then half wave rectified and passed to an RC circuit with a time constant of 4.7 s. The voltage across the RC circuit is the peak detector output which therefore represents the peak positive amplitude of the 2.5-50 Hz filtered sensor output occurring during the previous 5 seconds; however, the peak detector is determined at a rate of about every second (the VMAG AC data has been adjusted for this time offset). The X and Z peak detectors have full scale of 1oo nT peak to peak (= 5 Volts) and the Y peak detector has a full scale of 10 nT peak to peak (= 5 Volts). The analog 0 to 5 Volts peak detector outputs are sent directly to the PEM central electronics package where they are digitized into a 265 binary word. This is the raw value in the data. No in-flight calibration of the AC peak detection electronics is provided. The VMAG unit is located on the zenith boom of UARS. There is one data file per day for the PEM VMAG AC product, and the temporal coverage is from Oct. 1, 1991 to Aug. 23, 2005. Spatial coverage for the VMAG AC product ranges between -57 and +57 deg latitude. The VMAG AC data files are written in network binary format. For more information please review the PEM VMAG AC data format guide.
  • Version Description
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Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    2

    Quality
    Collection Progress

    Complete

    Publication References
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Related URLs
    Science Keywords
    • EARTH SCIENCE
    • SUN-EARTH INTERACTIONS
    • IONOSPHERE/MAGNETOSPHERE DYNAMICS
    • MAGNETIC FIELDS/MAGNETIC CURRENTS
Other Descriptive Keywords
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Ancillary Keywords
  • Magnetic Field
  • VMAG
ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Additional Attributes
  • Data Granularity
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    The time coverage of individual data granules.
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Acquisition Information Fields:

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Platforms
  • Earth Observation Satellites
    UARS
    Instruments
    • PEM
Projects
Project Short Name Campaigns Project Dates
EOSDIS No campaigns listed. No dates provided.
ESIP No campaigns listed. No dates provided.
UARS No campaigns listed. No dates provided.
CWIC No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • NASA/GSFC/SED/ESD/GCDC/GESDISC
    ARCHIVER
    Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

Data Contacts

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  • J.
    Investigator
    J. WINNINGHAM

    Space Science Department
    Southwest Research Institute
    P.O. Drawer 28510
    San Antonio, TX 78228-0510

  • RUDY
    Technical Contact
    RUDY FRAHM

    Space Science Department
    Southwest Research Institute
    P.O. Drawer 28510
    San Antonio, TX 78228-0510

  • JAMES
    Metadata Author
    JAMES JOHNSON

    NASA Goddard Space Flight Center
    Code 610.2
    Greenbelt, MD 20771

  • GES DISC HELP DESK SUPPORT GROUP
    Data Center Contact
    GES DISC HELP DESK SUPPORT GROUP

    NASA/GSFC/SED/ESD/GCDC/GESDISC

    Goddard Earth Sciences Data and Information Services Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • Email
    • 301-614-5224
    • 301-614-5268

Collection Citations Fields:

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