Observation of the heliosheet at meter wavelengths

Abstract The Nancay Radioheliograph provides detailed radio maps at 169 MHz of the solar corona. The meter wavelength maps are used in particular to map the heliosheet on the limb in a way similar to the HAO K-corona synoptic maps. In absence of X-ray observations, the radio data provides presently the unique possibility to compare directly the heliosheet structure with the solar chromospheric features because the radio emissions are also observed on the disk and may be followed during their transit on the sun.