First in-situ observations of neutral and plasma density fluctuations within a PMSE layer

Details First in-situ observations of neutral and plasma density fluctuations within a PMSE layer First in-situ observations of neutral and plasma density fluctuations within a PMSE layer

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2311l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 20, p. 2311-2314

Computer Science

Sound

41

Atmospheric Boundary Layer, Atmospheric Sounding, In Situ Measurement, Mesosphere, Neutral Particles, Plasma Density, Polar Regions, Radar Echoes, Atmospheric Turbulence, Eiscat Radar System (Europe), Fluctuation Theory, Radar Measurement, Sounding Rockets, Very High Frequencies

Scientific paper

The NLC-91 rocket and radar campaign provided the first opportunity for high resolution neutral and plasma turbulence measurements with simultaneous observations of PMSE (Polar Mesospheric Summer Echoes). During the flight of the TURBO payload on August 1, 1991, Cornell University Portable Radar Interferometer (CUPRI) and European Incoherent Scattter facility (EISCAT) observed double PMSE layers located at 86 and 88 km altitude, respectively. Strong neutral density fluctuations were observed in the upper layer but not in the lower layer. The fluctuation spectra of the ions and neutrals within the upper layer are consistent with standard turbulence theories. However, we show that there is no neutral turbulence present in the lower layer and that something else must have been operating here to create the plasma fluctuations and hence the radar echoes. Although the in situ measurements of the electron density fluctuations are much stronger in the lower layer, the higher absolute electron density of the upper layer more than compensated for the weaker fluctuations yielding comparable radar echo powers.

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