Virtual Ionosphere, Thermosphere, Mesosphere Observatory (VITMO)
Corrected Geomagnetic Coordinates and IGRF/DGRF Model Parameters

This service enables computation of a set of the main geomagnetic field model parameters and transformation from the GEOcentric spherical (geographic) coordinates to the Corrected GeoMagnetic (CGM) coordinates and vice versa. The algorithm is solely based on the DGRF/IGRF geomagnetic field models for Epochs 1900-2015. The B-min approach is applied to calculate CGM coordinates through the near-equator area where the definition of CGM coordinates is invalid. However, GEO <--> CGM transformations are not performed at certain regions where the CGM equator cannot be defined at all.

The following output parameters are calculated:

* Brief Description of CGM and Associated MLT Definition

*How to get model data from command line


* Select input parameters
Year (from 1900 to 2015):
Altitude above the 1-Re surface (km) [from 0. to 40000.]:
Latitude/Longitude below specified in:
Latitude (degrees) [from -90. to -20. or from 20. to 90.]: Longitude (degrees) [from 0. to 360.]:
*Profile parameters:
Start Stop Stepsize
Note: Number of points in profile should not exceed 50 (N <=50).
*Select output form:
List model data
Create model data file in ASCII format for downloading
List model data in XML format
Create model data file XML format for downloading
Plot model data 
      Note 1: The first selected parameter below always will be along the X-axis, the other selections will be along Y-axis.
              (e.g. if you want a Height profile, you may specify Height as the first parameter in the listing below.)     
      Note 2: User may get a scatter plot if he/she specifies any two parameters below and changes the "connect type"  
              in the "Advanced plot selections" to "show points only"   

* Select desired output parameters in profile
Input and Model Parameters for Starting Point (SP)
Year
Height, km
Geocentric Latitude, deg.
Geocentric Longitude, deg.
CGM Latitude, deg.
CGM Longitude, deg.
Horizontal comp. H,nT
Declination D,deg.
Vertical comp. Z,nT
Oval angle, deg. (see BD)
Meridian angle, deg. (see BD)
MLT in UT (hours)
Model Parameters for Conjugated Point (CP)
Geocentric Latitude, deg.
Geocentric Longitude, deg.
CGM Latitude, deg.
CGM Longitude, deg.
Horizontal comp. H,nT
Declination D,deg.
Vertical comp. Z,nT
Oval angle, deg. (see BD)
Meridian angle, deg. (see BD)
MLT in UT (hours)
Model Parameters for Footprint Point (FP)
Geocentric Latitude, deg.
Geocentric Longitude, deg.
CGM Latitude, deg.
CGM Longitude, deg.
Horizontal comp. H,nT
Declination D,deg.
Vertical comp. Z,nT
Oval angle, deg. (see BD)
Meridian angle, deg. (see BD)
MLT in UT (hours)
Model Parameters for Conjugated Point
which correspond Footprint Point(CP_FP)
Geocentric Latitude, deg.
Geocentric Longitude, deg.
CGM Latitude, deg.
CGM Longitude, deg.
Horizontal comp. H,nT
Declination D,deg.
Vertical comp. Z,nT
Oval angle, deg. (see BD)
Meridian angle, deg. (see BD)
MLT in UT (hours)
Some other Model Parameters
L-value of Starting Point (Apex), Re
North CGM Pole Latitude for Staring Point
     (N_CGM_pole_Latitude_SP), deg.
North CGM Pole Longitude for Staring Point
     (N_CGM_pole_Longitude_SP), deg.
South CGM Pole Latitude for Staring Point
     (S_CGM_pole_Latitude_SP), deg.
South CGM Pole Longitude for Staring Point
     (S_CGM_pole_Longitude_SP), deg.
North CGM Pole Latitude for surface of the Earth
     (N_CGM_pole_Latitude_SE), deg.
North CGM Pole Longitude for surface of the Earth
      (N_CGM_pole_Longitude_SE), deg.
South CGM Pole Latitude for surface of the Earth
      (S_CGM_pole_Latitude_SE), deg.
South CGM Pole Longitude for surface of the Earth
      (S_CGM_pole_Longitude_SE), deg.


Advanced plot selections (optional)
Connect Type: Character size(0.5-2.0)
Plot Symbol: Symbol Size(0.1-4.0):
Image size (pixels):X: Y:

Empirical Modeling of the Geomagnetic Field at JHUAPL http://geomag_field.jhuapl.edu/model/


If you have any questions/comments about this algorithm or computer code, contact:
Dr. Vladimir Papitashvili, c/o Dr. Natalia Papitashvili, E-mail: Natalia.E.Papitashvili@nasa.gov, Space Physics Data Facility, Mail Code 672, NASA/Goddard Space Flight Center, Greenbelt, MD 20771

NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility