Computer Science – Sound
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa21a..03z&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA21A-03
Computer Science
Sound
2407 Auroral Ionosphere (2704)
Scientific paper
Two sounding rocket experiments, CODA and JOULE, were carried out at Poker Flat Research Range, Alaska, on February 21, 2002, and March 27, 2003, respectively. Three chemical tracer rockets in CODA and one in JOULE were launched successfully as part of the experiments. The trimethyl aluminum (TMA) trails were released on the upleg and downleg portion of the flight between approximately 80 and 180 km altitude thus provided measurements of the horizontal neutral wind profiles under different conditions. The CODA and JOULE launches were both characterized by significant gradients in the plasma drifts, and thus the forcing, although CODA occurred during a substorm that followed a long period of quiet conditions while the JOULE launches occurred after many hours of active conditions. In CODA, the neutral wind had two peaks, namely at 95 to 100km with ~110m s-1 southwestward and 100 to 105km with ~140 m s-1 northeastward, while in JOULE the largest winds were at 115 to 120 km altitude with speeds of ~220m s-1 southwestward. Typical accuracies are 5-10 m s-1 over the altitude range covered by the releases. Large shears were found in both experiment, but at a lower altitude of 95 to 105 km in CODA, as compared to 110 to 115km in JOULE. The tip of the wind vector rotated clockwise, nearly tracing a circle in CODA, and counterclockwise but with a more linear polarization in JOULE. The elongated wind hodograph observed in the JOULE experiment is a characteristic of more active conditions when the flow is dominated by plasma forcing. The NCAR TIME-GCM model was used to simulate the conditions of the JOULE experiment. The results show some structure that is similar to the observed winds, but in general, the model winds are much smaller in magnitude and have much weaker gradients. The talk focuses on a description of the geophysical conditions in the two experiments, on the rocket wind measurements, and on the comparison of the wind profiles under quiet and disturbed condition with the TIME-GCM model simulation results.
Crowley Geoff
Larsen Mark F.
Mikkelson I. S.
Zhan Tao
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