Earth observation satellites employ various types of remote-sensing instruments to peer into the secrets of the
atmosphere. Many of these instruments collect two-dimensional data stored as raster images which can be easily georeferenced
and overlaid onto a virtual globe, with stunning results. However, certain instruments collect threedimensional
science data which can pose a significant challenge for visualization efforts. The Tropospheric Emission
Spectrometer (TES) is such an instrument which collects scientific data about atmospheric chemistry and stores the
outputs in an Oracle database. With some imaginative programming, the data is transformed into interesting and
information-packed visualizations using shell scripts, SQL scripts and Oracle stored procedures to yield Google Earthformatted
files. This Google Earth content is hosted on the TES external web site for use by the public.
KEYWORDS: Databases, Data processing, Satellites, Information operations, Space operations, Calibration, Visualization, Atmospheric chemistry, Spectroscopy, Computing systems
The Science Data Processing System (SDPS) application, described herein as an example, has had a long development
cycle. The SDPS application incorporates IDL, C++, and Perl programming languages, with significant use of an Oracle
Relational Database Management System (RDBMS). The time involved from initial design, 1996, to operational
deployment, on July 15th, 2004, with the launch of the Aura spacecraft, spans several releases of the Oracle RDBMS.
New database versions usher in new features and performance enhancements, sometimes requiring modifications to
custom application code to take full advantage of improvements in technology. For a project with an aggressive release
schedule, major redesigns of the custom code could jeopardize the successful completion of mission criteria.
Over time, higher throughput requirements and hardware improvements in the application computing infrastructure
revealed database performance bottlenecks due to increased scanning frequency of ever-growing tables and indexes. The
Distributed Schema (DS) database redesign successfully addressed the database scalability and performance limitations,
with only minor SIPS application changes and no changes to the TES SDPS application.
Experiments performed in the Soviet Union have demonstrated that the relativistic multiwave Cerenkov generator (MWCG) is capable of producing very high power centimeter and millimeter wavelength radiation at high conversion efficiencies. The MWCG configuration consists of a high power relativistic annular electron beam propagating in close proximity to a highly overmoded cylindrically symmetric cavity region which has two rippled wall sections separated by a constant radius drift space. The design of a highly overmoded MWCG experiment is described. The experiment is designed to operate at a frequency of 35 GHz with output power capability in the 100 MW range.
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