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Fig. 13.11 Worldwide distribution of ionosonde stations
the variation of electron density with height up to the peak of the ionosphere. Such
electron-density profiles provide most of the Information required for studies of the
ionosphere and its effect on radio communications.
The WDC receives data from the many Ionosonde stations around the world
through a variety of means including ftp, email, CD-ROM. Data is provided in a
number of formats: raw data, URSI (simple hourly resolution) and IIWG (more
complex, time varying) standard formats as well as station specific “bulletins”.
The WDC stored data in digital formats comprises 2.9 GB of data in IIWG format
and 70 GB of Multi-Maximum Method (MMM) formatted data, SAO, ART files
from Lowell digisondes. The WDC also holds about 40,000 rolls of 16/35 mm film
ionograms and
10,000 monthly bulletins of scaled ionospheric data. Some of this
data is already in digital from, but much, particularly the ionogram images, are yet
to be digitised.
Some Ionosonde stations provide a small set of standard parameters in a station
specific “bulletin” format which is similar to the paper bulletins traditionally pro-
duced from the 1950 s onwards. The WDC has some bespoke, configurable software
to extract the data from these bulletins and convert it to IIWG format, this kind of
raw data forms the basis of this case study.
13.7.6.1.1 Determining What Needs to Be Captured
This case study will briefly discuss how the Authenticity Management tool can be
used to capture prominent PDI about the WDC's process of ingestion and archival,
resulting in the creation of an Authenticity Execution Report for the raw Ionosonde
data which has been received. The resultant Authenticity Execution Report would
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