The Low-Latitude Ionosphere Sector model (LLIONS) is used to model
an extended region of the ionosphere using the vertical drifts
determined from the CEBU ionosonde results from February 18, 1999.
The WestPac experiment was composed of a chain of ionosondes along
the magnetic meridion at 120 deg East Longitude. The CEBU ionosonde
can provide a measure of the vertical drifts to drive the model
ionosphere. However, cross equator winds may be important for the
plasma distribution in the meridion and the evening instabilities
development. Therefore, off-equator ionograms are going to be
used in determining the cross equator winds.
Presently, we will run two situations. Both are driven by the
calculated vertical drift observed at CEBU on February 18, 1999.
Model run #1 will use the Horizontal Wind Model (HWM-93) for the
winds. Model run #2 will have the HWM-93 winds plus a constant
100 m/s northward wind to examine the effect of cross equator
winds on ESF.
The symmetry of the equatorial ionization anomalies are apparent in run #1.
