Equivalent Ionospheric Currents over North America and Greenland

Curator: James Weygand
Institute of Geophysics and Planetary Physics, UCLA
Phone: (310) 825-3547
E-mail: jweygand(at)igpp.ucla.edu

Additional Contact: Dr. Olaf Amm
Finnish Meteorological Institute
telephone: +358-9-1929-4689
E-mail: Olaf.Amm(at)fmi.fi

James Weygand's Office Hours:

Monday through Friday from 07:00 to 18:00 (PST).


Matlab programs are available to combine the spherical elementary currents
with total electron content measurements, SuperDARN flows, and THEMIS
all sky images.

Data Access:

Contact James Weygand. E-mail above.
Olaf and I would like to carefully check each event thoroughly before giving out the data.


Amm, O., and A. Viljanen, Ionospheric disturbance magnetic field continuation
from the ground to the ionosphere using spherical elementary current systems,
Earth Planets Space, 51,431-440, 1999.

Weygand et al., Application and Validation of the Spherical Elementary Currents
Systems Technique for Deriving Ionospheric Equivalent Currents with the North
American and Greenland Ground Magnetometer Arrays, J. Geophys. Res.,
115 doi:10.1029/2010JA016177, 2011.

The Code:

The original Matlab code was provide by Dr. Olaf Amm [Amm and Viljanen, 1999].
James Weygand has adapted the code to include ground magnetometer data from CANMOS,

The Data

Inputs: Nearly all the data was obtained from: CANMOS, CARISMA, GIMA, DTU (Greenland), MACCS,
McMAC, THEMIS, STEP, and USGS. Some data was obtained directly from the PIs.

Outputs: Equivalent ionospheric currents over most parts of Canada, Alaska,
until the Greenland coast (roughly corresponding to an area of about 40 degrees
latitude and 120 degrees longitude)"

Equivalent Ionospheric Current Data Availability

Arrays Involved Interval (YYYY/MM/DD to YYYY/MM/DD)
2007/01/01 to 2013/12/31

Example Event

Equivalent Ionospheric Currents
Scaling factors of spherical elementary currents systems (proportional to FAC for uniform conductances)


April 5, 2010 Storms and Substorms


CANMOS and CARISMA: These data were obtained rom the Canadaian Space Science Data Portal.
The Canadian Space Science Data Portal is funded in part by the Canadian Space Agency (CSA),
the Alberta Science and Research Authority (ASRA), and the University of Alberta (UofA).
Also see CARISMA rules of the road.

CANMOS data were obtained by the Canadian Magnetic Observatory Network (CANMON),
maintained and operated by the Geological Survey of Canada, provided the data used in this study -

GIMA: acknowledge the Geophysical Institute, University of Alaska Fairbanks.

Greenland: acknowledge the Technical University of Denmark (DTU).

MACCS: Magnetometer Array for Cusp and Cleft Studies (MACCS) array is
supported by US National Science Foundation grant ATM-0827903 to Augsburg College.
We would like to would like to thank the following:
M. J. Engebretson, D. Murr, and E.S. Steinmetz at Augsburg College and the MACCS team.

THEMIS: see THEMIS rules of the road.

STEP: STEP magnetometer file storage is at Department of Earth and Planetary Physics,
The University of Tokyo and maintained by Dr. Kanji Hayashi (hayashi.AT.grl.s.u-tokyo.ac.jp)

McMAC: The McMAC Project is sponsored by the Magnetospheric Physics Program of National Science Foundation and maintained by Dr. Peter Chi (pchi AT igpp.ucla.edu)

USGS: The USGS Geomagnetism Program

Questions or Corrections can be directed to : jweygand$at$igpp.ucla.edu
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