IONOSPHERIC DIGITAL DATABASE
WORLDWIDE VERTICAL INCIDENCE
CD-ROM DATASET
The National Geophysical Data Center (NGDC) wishes to announce
the July 1994 release of the Ionospheric Digital Database of
Worldwide Vertical Incidence Parameters on two compact discs
(CDs) with custom-designed access and display software.
The CDs contain 40,000 station months (1350 megabytes) of
digitized vertical incidence parameters from 130 sites around the
world. These data have been contributed through a major effort
among the World Data Centers and many ionosonde network
organizations.
The User Documentation Manual included with the CD dataset
package details instructions for equipment set up and
installation of the software as well as information about the
ionosphere and ionograms, vertical incidence parameters, data
collection, quality control, format descriptions, and user
instructions for the software. Instructions and navigation
commands are also provided on-line as context-sensitive help
windows inside the IDD display software.
With the Ionospheric Digital Database software, the user may
browse and display any data on the CD database. In the
individual mode a graph of the diurnal distribution for up to one
month is displayed along with the monthly median values.
Comparative or composite modes display up to six datasets of any
combination of station, date, and ionospheric parameter data
available. The browse mode allows the user to search through the
numerical values in any one of the selected datasets.
The graphs that you create can be saved as PCX files for display
at a later time or for creating your own series of computerized
images for visual reproduction.
A world map with both Geographic Longitudes and Latitudes as well
as corrected Geomagnetic Latitudes displays the catalog of all
ionosonde stations and stations with digital data contained on
the CD database. The catalog of digital stations may be searched
by any geographic area, date, or ionospheric parameter ascertain
availability of data. The map and a list of the stations
containing digital data for the selection can be saved.
All the data contributed come from 1957 through 1990. They have
been digitized, reformatted, converted to universal time (the
software also can display the data in local meridian time), and
passed through quality control filters. In November 1993, the
Ionospheric Informatic Working Group (IIWG) format was adopted.
Corrections, data to fill existing gaps, and data from before and
after the 1957 through 1990 period of this release will be added
to this continuing database. These data can be obtained from
NGDC and will be issued on CDs in the future.
Corrections, data to fill existing gaps, and data from before and
after the 1957 through 1990 period of this release will be added
to this continuing database. These data can be obtained from
NGDC and will be issued on CDs in the future.
Click here for more information.
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