M. Mendillo, B. Herniter, Department of Astronomy,Boston University, 725 Commonwealth Avenue, Boston, Massachusetts 02215

**Brief Description**:

__The Semi-Empirical Low-Latitude Ionospheric Model (SLIM)__ is based on a
theoretical simulation of the low latitude ionosphere. Electron density
profiles (180 km to 1800 km) are determined for different latitudes (every 4
degrees between 24 N and 24 S dip latitude) and local times (every hour) by
solving the continuity equation for O+ ions. The profiles are normalized to the
F2-peak density and are then represented by Modified Chapman function using six
coefficients per individual profiles. Calculations are performed for the
equinox, June solstice, and December solstice, and for solar cycle minimum and
maximum. In total the __SLIM__ model consists of 3 _ 2 _13 _ 24 = 1,872
profiles and 1,872 _ 6 = 11,232 coefficients. Input parameters used in the
theoretical calculation include the MSIS model
neutral temperatures and densities, the IRI model
temperature ratios and the diurnal ion drift patterns observed by the
Jicamarca incoherent scatter radar for the different seasons (see also the FAIM Model).

**Availability**: The profile tables and coefficients are available from
authors.

**References**:

D. N. Anderson, M. Mendillo, and B. Herniter, A Semi-Empirical, Low-Latitude
Ionospheric Model, Air Force Geophysics Laboratory, Report AFGL-TR-85-0254,
Hanscom AFB, Massachusetts, 1985.

D. N. Anderson, M. Mendillo, and B. Herniter, A Semi-Empirical Low-Latitude Ionospheric Model, Radio Sci. 22, 292, 1987.

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