Scientific and Technical Aerospace Reports Volume 39 April 6, 2001

validate a methodology by which drag information from all available low-altitude space objects is used to update any given density
model on a comprehensive basis. The basic update and prediction algorithms and a technique to estimate true ballistic factors are
derived in detail. A full simulation capability is independently verified. The process is initially demonstrated using simulated
range, azimuth, and elevation observations so that issues such as required number and types of calibration satellites, density of
observations, and susceptibility to atmospheric conditions can be examined. Methods of forecasting the density correction models
are also validated under different atmospheric conditions.
DTIC
Atmospheric Density; Atmospheric Models; Real Time Operation; Algorithms; Forecasting
20010024160 Colorado Univ., Physics Dept., Boulder, CO USA
Aerosol and Plasma Measurements in Noctilucent Clouds Final Report, 1 Jun. 1997 - 30 Nov. 2000
Robertson, Scott, Colorado Univ., USA; Nov. 30, 2000; 3p; In English
Contract(s)/Grant(s): NAG5-4526; No Copyright; Avail: CASI; A01, Hardcopy; A01, Microfiche
The purpose of this project was to develop rocket-borne probes to detect charged aerosol layers in the mesosphere. These
include sporadic E layers, which have their origin in meteoric dust, and noctilucent clouds, which form in the arctic summer and
are composed of ice crystals. The probe being developed consists of a charge collecting patch connected to a sensitive electrometer
which measures the charge deposited on the patch by impacting aerosols. The ambient electrons and light ions in the mesosphere
are prevented from being collected by a magnetic field. The magnetic force causes these lighter particles to turn so that they miss
the collecting patch.
Author
Noctilucent Clouds; Aerosols; Plasmas (Physics); Probes; Rocket-Borne Instruments; Rocket Launching
20010025272 NASA Goddard Space Flight Center, Greenbelt, MD USA
Ozone in the Pacific Troposphere from Ozonesonde Observations
Oltmans, S. J., National Oceanic and Atmospheric Administration, USA; Johnson, B. J., National Oceanic and Atmospheric Administration,
USA; Harris, J. M., National Oceanic and Atmospheric Administration, USA; Voemel, H., National Oceanic and Atmospheric Administration,
USA; Koshy, K., University of the South Pacific, Fiji; Simon, P., MeteoFrance, French Polynesia; Bendura, R., NASA Langley
Research Center, USA; Thompson, A. M., NASA Goddard Space Flight Center, USA; Logan, J. A., Harvard Univ., USA; Hasebe, F., Ibaraki
Univ., Japan; [2000]; 78p; In English; No Copyright; Avail: CASI; A05, Hardcopy; A01, Microfiche
Ozone vertical profile measurements obtained from ozonesondes flown at Fiji, Samoa, Tahiti and the Galapagos are used to
characterize ozone in the troposphere over the tropical Pacific. There is a significant seasonal variation at each of these sites. At
sites in both the eastern and western Pacific, ozone is highest at almost all levels in the troposphere during the September-November
season and lowest during, March-May. There is a relative maximum at all of the sites in the mid-troposphere during all seasons
of the year (the largest amounts are usually found near the tropopause). This maximum is particularly pronounced during, the
September-November season. On average, throughout the troposphere at all seasons, the Galapagos has larger ozone amounts than
the western Pacific sites. A trajectory climatology is used to identify the major flow regimes that are associated with the characteristic
ozone behavior at various altitudes and seasons. The enhanced ozone seen in the mid-troposphere during September-November
is associated with flow from the continents. In the western Pacific this flow is usually from southern Africa (although 10-day
trajectories do not always reach the continent), but also may come from Australia and Indonesia. In the Galapagos the ozone peak
in the mid-troposphere is seen in flow from the South American continent and particularly from northern Brazil. The time of year
and flow characteristics associated with the ozone mixing ratio peaks seen in both the western and eastern Pacific suggest that
these enhanced ozone values result from biomass burning. In the upper troposphere low ozone amounts are seen with flow that
originates in the convective western Pacific.
Author
Ozone; Troposphere; Observation; Annual Variations; Biomass Burning; Climatology; Flow Characteristics
20010025273 NASA Goddard Space Flight Center, Greenbelt, MD USA
Radiative Properties of Cirrus Clouds in the Infrared (8-13 microns) Spectral Region
Yang, Ping, Scientific Systems and Applications, Inc., USA; Gao, Bo-Cai, Naval Research Lab., USA; Baum, Bryan A., NASA
Langley Research Center, USA; Hu, Yong X., NASA Langley Research Center, USA; Wiscombe, Warren J., NASA Goddard
Space Flight Center, USA; Tsay, Si-Chee, NASA Goddard Space Flight Center, USA; Winker, Dave M., NASA Langley Research
Center, USA; [2000]; 62p; In English; Original contains color illustrations
Contract(s)/Grant(s): DE-AI02-00ER-62901; NASA Order S-97894-F; No Copyright; Avail: CASI; A04, Hardcopy; A01,
Microfiche
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