Layers in the equatorial mesosphere, motions and aerosol: Rocket and radar measurements during equis II

G. A. Lehmacher, C. L. Croskey, J. D. Mitchell, M. Friedrich, K. Torkar, F. J. Lübken, M. Rapp, Erhan Kudeki

Research output: Contribution to journalConference articlepeer-review


The NASA EQUIS II (Equatorial Ionosphere Studies) campaign was conducted in August/September 2004 at U.S. Army Kwajalein Atoll/Reagan Test Site on Roi-Namur, Marshall Islands (9° N, 168° E). The LEMMA (Layers in the Equatorial Mesosphere, Motions and Aerosol) program was devoted to neutral and plasma density fluctuations in the equatorial mesosphere and lower thermosphere. One objective was to detect layers of small scale structures that might be related to mesospheric VHP radar echoes observed regularly at equatorial and low latitudes. The payload carried multiple instruments from U.S. and European investigators, including an ionization gauge for the first in situ measurements of neutral turbulence fluctuations in the equatorial mesosphere. One sounding rocket and three falling spheres were launched successfully on September 20, 2004, supported by a large, steerable 422 MHz UHF radar receiving incoherent backscatter from ∼85-700 km. We give an overview of the investigation and present some results including the comparison of in situ and ground based electron density measurements, neutral temperature and wind structure, and observations of neutral and electron density fluctuations.

Original languageEnglish (US)
Pages (from-to)167-172
Number of pages6
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number590
StatePublished - 2005
Event17th ESA Symposium on European Rocket and Balloon Programmes and Related Research - Sandefjord, Norway
Duration: May 30 2005Jun 2 2005

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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