During the Noctilucent Cloud Campaign from Esrange, Kiruna, Sweden in July--August 1991, detail in situ measurements were performed by means of plasma probes in the TURBO rocket payload. When launched through NLC and PMSE layers these probes indicate that NLC layer was associated with a one kilometer thick region containing heavy positive ions. Embedded in this layer were structures only a few tens of meters in vertical extent. These structures exhibited strongly enhanced ion current and corresponding sharp decrease of electron current. The observations indicate that the structures contain enhanced densities of light positive ions as wll as heavy, negative charge carriers in the form of ions particles. VHF radar measurements from the same site showed Polar Summer Mesospheric Echoes from a layer that at first was located just above the NLC layer, but the rocket results indicate that it later merged with the NLC-layer. ¿American Geophysical Union 1993