A three-sensor interferometry method is employed to parameterize the brightness distribution of VHF radar returns from midlatitude E region plasma irregularities monitored by the Chung-Li radar in Taiwan. The angular half-width of the brightness distribution in the direction parallel to the geomagnetic field is estimated as similar to 0.2 degrees. In the orthogonal direction the angular half-width is measured as similar to 0.5 degrees-1 degrees. The results suggest that meter scale field-aligned plasma irregularities responsible for the observed echoes were organized in localized patches with 2 to 4 km cross-field scales.
