Mathematics – Logic
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.471..157g&link_type=abstract
In: 15th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 28 - 31 May 2001, Biarritz, France. Ed.:
Mathematics
Logic
1
Earth Mesosphere, Rockets
Scientific paper
DROPPS (The Distribution and Role of Particles in the Polar Summer Mesosphere), a highly coordinated international study conducted in July, 1999, involved two sequences of rockets launched from the Norwegian rocket range in Andøya, Norway. These studies were designed to investigate the properties of the polar summer mesosphere, particularly relating to polar mesospheric summer echoes (PMSE) and their possible relationship to particles (aerosol and dust layers) and to noctilucent clouds (NLC). Each of the two sequences included a DROPPS NASA-Black Brant payload, consisting of an array of instruments to measure the electrodynamic and optical structure of the mesosphere and lower thermosphere. These were provided by participants from several US and European scientific laboratories. The DROPPS payloads were each accompanied by a sequence of several European payloads (MIDAS, Mini-MIDAS, and Mini-DUSTY) designed to study electrodynamic structure of the same region, and by several meteorological rockets to provide wind and temperature data in the critical region of study. ALOMAR Lidars, and MF and MST Radars (all located adjacent to the Andøya launch site) were used to continuously monitor the mesosphere for NLCs and PMSEs, respectively. EISCAT VHF radar (Tromsø, Norway) provided similar information about PMSEs. Sequence 1 was launched during the night of 5 - 6 July into a strong PMSE display with a weak NLC at the base of the PMSE. Sequence 2 was launched on the early morning of 14 July into a strong NLC, but surprisingly with no PMSE evident. Of note is the observed presence of negatively charged particles within the PMSE region but absent from the NLC. The PMSE layer also contained electrodynamic turbulence, which was absent within the NLC observed during Sequence 2. As noted above, DROPPS was designed to investigate the origin of PMSEs and how they might relate to NLCs. This paper provides an overview of the program and discusses the above findings.
Croskey Charles L.
Friedrich Manuel
Goldberg Richard A.
Gumbel Jörg
Holzworth Robert H.
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