Abstract
Modern digital ionosondes /1/ represent the most practical method for routine measurement of electron density profiles in the ionosphere. However, inversion of ionogram data to produce an N(h) profile suffers from the well known valley problem /2/. Regions of decreased ionization between the ionospheric layers do not reflect the radio wave and the resulting discontinuity leads to uncertainty in the true height above the valley region. Incoherent scatter radar is capable in principle of providing direct information on the electron density variation within the E-F valley. Colocation of a Digisonde 256 sounder with the Millstone Hill incoherent scatter radar affords the opportunity to carry out detailed comparisons.
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