ENLIL with Cone Model

Model Developer(s)
D. Odstrcil
University of Colorado at Boulder

Model Description
ENLIL is a time-dependent 3D MHD model of the heliosphere. It solves equations for plasma mass, momentum and energy density, and magnetic field, using a Flux-Corrected-Transport (FCT) algorithm. Its inner radial boundary is located beyond the sonic point, typically at 21.5 or 30 solar radii. It can accept boundary condition information from either the WSA or MAS models. The outer radial boundary can be adjusted to include planets or spacecraft of interest (eg 2 AU to include both Earth and Mars, 5 AU to include Ulysses, 10 AU to include Cassini). It covers 60 degrees north to 60 degrees south in latitude and 360 degrees in azimuth.

ENLIL + Cone Model Description:
ENLIL cone model forecasts CME propagation from the ENLIL inner boundary (which is usually at 21.5 Rs) to the point of interest. The cone model is based on the idea that close to the Sun CME propagates with constant angular and radial velocity, and so has the shape of a cone. ENLIL takes the cone model input parameters at its inner boundary. These input parameters are the following:

1. Start date (yyyy-mm-dd).

2. Start time (hh-mm)
This is the moment of time (UT) when the CME reaches ENLIL inner boundary.

3. Cone latitude (deg).
Co-latitude of the cone axis (angle Lat in the Figure 1)

4. Cone longitude (deg).
Longitude of the CME cone axis (angle Long in the Figure 1, (note Long=180 degrees is in the Earthward direction )

5. Cone radius (deg).
Angular width of the cone (angle rad in the Figure 1).

6. Radial velocity (km/s) at the ENLIL inner boundary.

References and relevant publications
Xie et al., JGR, vol 109, A03109; doi:10.1029/2003JA010226, 2004.

Relevant links

• General description of ENLIL model
• Description of the data structure and organization in the ENLIL
• General description of Solar wind, time description systems & coordinate systems used and more.
  This file also contains instructions for installation.

CCMC Contact(s)

301-286-2061

Developer Contact(s)

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