This directory contains Earth electron density field data

IRI*.xml
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- Global electron density fields from IRI2012 model (created from Fortran code provided on IRI website: http://nssdcftp.gsfc.nasa.gov/models/ionospheric/iri/)

- provided for:
  - solar maximum and minimum cases ( Rz,IG=[0,-5] and [200,195] )
  - 3-hourly UTC grid
  - summer and winter solstice and spring and fall equinox

- as xml provided with resolution 5deg x 5deg on irregular altitude grid
- naming convention: IRI_[solar activity]_[season]_[UTC].Ne.xml

- originally given over altitude, (globally fixed) conversion to pressure done assuming hydrostatic equilibrium with constants (gravity, gas constant, mean molecular weight) chosen as set or suggested by ARTS. resulting p_grid and z_field stored in IRI.Ne.z.xml (as true 3D with lat=[-90,90] and lon=[0,360]).