Issue 10 Volume 41 May 16, 2003

suited for evaluating the impact of seismic senor configuration on network tracking performance. Results are presented for a
number of different network configurations representative of battlefield situations.
DTIC
Monte Carlo Method; Tracked Vehicles; Seismology; Error Analysis; Computerized Simulation; Position (Location)
20030033081 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Middle Atmosphere Temperature Trends from Small Rocketsondes
Schmidlin, F. J.; January 2002; 1 pp.; In English; American Geophysical Union, 6-10 Dec. 2002, San Francisco, CA, USA;
No Copyright; Avail: Other Sources; Abstract Only
Stratospheric temperature trends derived from USA meteorological rocketsonde measurements obtained between the late
1960’s and mid 1990’s are examined at the 50-, 40-, and 25-km altitude levels. Although the trends are different at each of
the launch locations there is an unequivocal downward slope of about -0.1 K to -0.3K per year at many of the launch sites.
Distances between launch sites and, in some cases unequal data-record lengths, inhibit determination of trend interrelationship
among the various sites. Although the data only provide a ‘snapshot’ of atmospheric behavior for the specific
location, a particular advantage resulting from using these particular rocketsonde observations is their consistency over time.
Thus, using the same rocketsonde type over the data period, i.e., Datasonde insures a significant reduction of instrument
induced anomalies in the temperature profiles. Trends at the 25-km altitude level, approximately 30 hPa, are compared with
trends from radiosonde observations. Both rocketsonde and radiosonde measurements were obtained at approximately the
same local times and within less than 100 km of each other. Rocketsonde temperatures from the Former Soviet Union are also
used and often complement trends from US data.
Author
Atmospheric Temperature; Middle Atmosphere; Radiosondes; Temperature Profiles; Trend Analysis
20030033853 NASA Goddard Space Flight Center, Greenbelt, MD, USA
Particle Events as a Possible Source of Large Ozone Loss during Magnetic Polarity Transitions
vonKoenig, M.; Burrows, J. P.; Chipperfield, M. P.; Jackman, C. H.; Kallenrode, M.-B.; Kuenzi, K. F.; Quack, M.; [2002];
10 pp.; In English; Copyright; Avail: CASI; A02, Hardcopy
The energy deposition in the mesosphere and stratosphere during large extraterrestrial charged particle precipitation
events has been known for some time to contribute to ozone losses due to the formation of potential ozone destroying species
like NO(sub x), and HO(sub x). These impacts have been measured and can be reproduced with chemistry models fairly well.
In the recent past, however, even the impact of the largest solar proton events on the total amount of ozone has been small
compared to the dynamical variability of ozone, and to the anthropogenic induced impacts like the Antarctic ‘ozone hole’. This
is due to the shielding effect of the magnetic field. However, there is evidence that the earth’s magnetic field may approach
a reversal. This could lead to a decrease of magnetic field strength to less than 25\% of its usual value over a period of several
centuries . We show that with realistic estimates of very large solar proton events, scenarios similar to the Antarctic ozone hole
of the 1990s may occur during a magnetic polarity transition.
Author
Geomagnetism; Ozone Depletion; Proton Precipitation; Magnetic Effects; Solar Protons
20030033871 Smithsonian Institution, Cambridge, MA, USA
Metallicity Effects on Stellar Magnetic Activity: Blanco 1 as a Test Case
Harnden, F. R., Jr.; Mushotzky, Richard F., Technical Monitor; March 2003; 3 pp.; In English
Contract(s)/Grant(s): NAG5-10005; No Copyright; Avail: CASI; A01, Hardcopy
We present X-ray Luminosity Distributions (XLDs) of late-type members (dF, dG, dK, dM) of the Blanco 1 cluster, based
on ROSAT-HRI data and new astrometric-photometric membership obtained from the GSC-II project. For the first time we
present the XLD of dM stars of this cluster. The high metallicity of Blanco 1 allows us to investigate the role of chemical
composition on the coronal emission of late-type stars. Comparison between X-ray Luminosity Distributions of Blanco 1 and
Pleiades, NGC2516 and alpha Per suggests a possible metallicity effect in dM stars.
Author
X Rays; Luminosity; Spectral Energy Distribution; Pleiades Cluster; Metallicity
20030036984 Instituto Nacional de Pesquisas Espacias, Sao Jose dos Campos, Brazil
Zonal Drifts and Dynamical Study of the Plasma Bubbles Over the Tropical Region
Pimenta, Alexandre Alvares; 2003; 189 pp.; In Portuguese; Original contains black and white illustrations
Report No.(s): INPE-9546-TDI/827; Copyright; Avail: CASI; A09, Hardcopy
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