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AMPERE Virtual Geomagnetic Observatory (VGO) Higher Level Data Products

AMPERE Virtual Geomagnetic Observatory (VGO) data are derived estimates of the departures of the Earth's magnetic field at 780 km altitude relative to the International Geophysical Reference Field, generation 11 (IGRF-11, Finlay et al., 2010) magnetic field reference model. VGO estimates were derived from Iridium Block-1 satellite magnetic field observations as described in Anderson et al. (2021), which should be studied before using this high-level dataset.

These results do not preserve the magnitude of the main field as the data processing applies an inter-calibration of the observations against IGRF-11. Apart from this calibration scale factor, the VGO data reflects the true geometry of the geomagnetic field.

Dates for which VGO data are provided span from January 2010 to December 2016 in a non-monotonic fashion. These dates were selected to be the quietest set of days within each month and quarter as described in Anderson et al. (2021).

VGO data file contents:

  • The magnetic field difference relative to IGRF-11 at 780 km attitude for each geographic latitude and longitude entry.
  • The magnetic field is given in spherical polar coordinates, radial, polar angle (theta) increasing southward (i.e., co-latitude), and azimuth (phi) increasing eastward.

When using these data for publications of research analysis, please cite Anderson et al. (2021) and follow the Rules of the Road guidelines for AMPERE data products.

Download VGO Data Files

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News and Updates

  • August, 2022
    AMPERE Website Updated!
  • August, 2022
    AMPERE-NEXT data officially released!
  • May, 2022
    AMPERE Block-1 data reprocessed with new baseline filtering
  • March, 2022
    Center for Geospace Storms selected for Phase II DRIVE Science Centers, utilizing AMPERE data in new modeling and analysis framework. See https://cgs.jhuapl.edu for more details.
  • October, 2021
    Iridium NEXT data processing complete!
  • August, 2021
    AMPERE Block-1 data now available for 8 additional months, with complete coverage from January 2010 through August 2017
  • June, 2021
    AMPERE Virtual Geomagnetic Observatory data now available for download!
  • December, 2020
    AMPERE data now integrated into AMGeO! See https://amgeo.colorado.edu for more details on AMGeO assimilations and access to model.
  • September, 2020
    New web API service for download of Block-1 raw dB time series implemented
  • July, 2019
    Iridium NEXT data processing begins
  • January, 2019
    Launches for Iridium NEXT constellation complete!
  • September, 2017
    AMPERE data production paused for transition from Block-1 to NEXT constellation
  • January, 2017
    First launch of the Iridium NEXT constellation a success!

All updates

AMPERE magnetic perturbation data and data products derived from the Iridium constellation are provided via the AMPERE Science Data Center to the scientific community for basic research in space weather and magnetosphere-ionosphere physics.

Principal Investigator: Brian Anderson

Website Design: Rob Barnes and Matt Potter

robin.barnes@jhuapl.edu

AMPERE is funded by NSF
NSF