CRIT-II ELECTRIC AND MAGNETIC OBSERVATIONS INSIDE AND OUTSIDE AN IONIZING NEUTRAL JET

The full electric and magnetic field data set from the subpayload of t he GRIT II sounding rocket experiment is presented for the first time. GRIT Ii was an ionospheric injection experiment aimed at studying the critical ionization velocity (CIV) effect. It consisted of two payloa ds located on nearly the same magnetic field line. By using the data f rom both payloads, we are able to reach a good understanding of the mo mentum transfer between the injected ions and the ambient ionosphere. The data also make it possible to resolve the conflict between the two competing models for the energy transfer from the newly created ions to hot electrons in the CIV process. The results give a natural coupli ng between the energy and momentum transfer processes in CIV experimen ts.