Geomagnetism

Prompt Penetration Equatorial Electric Field Model PPEEFM1

Real-time model of the ionospheric electric field Wind driven currents in the ionosphere coupled with the Earth's magnetic field produce the Equatorial Electric Field (EEF), which is responsible for driving many interesting ionospheric phenomena. The EEF is known to be highly variable from day to day, primarily as a result of solar wind electric fields penetrating from high latitudes to the equator, in addition to variabilities in the neutral winds coming from below. This work realistically models the daily variations coming from the solar wind, which are mapped from interplanetary electric field (IEF) data through a transfer function model. The transfer function was derived from 8 years of IEF data from the ACE satellite, radar data from JULIA, and magnetometer data from the CHAMP satellite. This model also provides the climatology of the EEF, which is based on six years of magnetometer measurements from the CHAMP satellite. The model accepts as input a time and location and produces the best estimate of the EEF for those parameters.

Fig. 1: (Left) Input to the prompt penetration (PP) part of the model. (Right) Output from the PP model

Fig. 2: Climatological structure of the EEF as a function of longitude and local-time for different seasons

Available PPEEFM1 Downloads
	Type	Format	Mbyte	Contents
	Model (driver and coefficients)	tar/gz	0.3	PPEEFM1 Model driver program source code and coefficients
	Article	PDF	0.3	Electric fields in the equatorial ionosphere derived from CHAMP satellite magnetic field measurements (preprint)
	Article	PDF	0.3	Penetration characteristics of the interplanetary electric field to the day-time equatorial ionosphere (preprint)

Manoj Nair

Patrick Alken