Photographic Records Showing the Variations of the Virtual Height of Reflection as a Function of the Radio Frequency
The standard (analog) ionosonde produces photographic records known as ionograms,
which show the variations of the virtual height of reflection as a function of the
radio frequency. The frequency band normally used is from about 1 MHz to about 20
MHz though some ionosondes operate down to about 0.20 MHz and up to 30 MHz. The ionograms
actually show the time of travel of the pulse signal from the transmitter to the ionosphere
and back to the receiver. A given station typically generates a sweep-frequency ionogram
in about two minutes. Normally four ionograms are taken per hour, one at each quarter
hour. As of May 1994, there are approximately 16,140 rolls of ionogram film at our
Data Center. Most of these photographic records (ionograms) were recorded on 35mm
film, but there are some 16mm ionogram film. One month of 35mm ionograms averages
about 800 feet of film. These rolls of film are kept off site but can be retrieved
when needed. If you would like to study specific ionograms, researchers are welcome
at the NOAA National Centers for Environmental Information (formerly National Geophysical
Data Center), but are requested to give adequate advance notice of their visit so
that appropriate arrangements may be made for their work space at the Data Center.
Some ionograms were digitized and are stored in TIF G4 format.
Cite this dataset when used as a source.
- ID not available.
gov.noaa.ngdc.stp.ionosonde:G00551
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Distribution Formats |
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Ordering Instructions | Non-Digital Form: 35 mm Film Reels Ordering Instructions: Contact Data Center Custom
Order Process: Contact data center for information Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information |
Distributor | Justin Mabie Space and Terrestrial Weather Specialist DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6135 Justin.Mabie@noaa.gov |
Dataset Point of Contact | Justin Mabie Space and Terrestrial Weather Specialist DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (303) 497-6135 Justin.Mabie@noaa.gov |
Time Period | 1944-03-01 to Present |
Spatial Bounding Box Coordinates |
West:-180.000000
East:180.000000
South:-90.000000
North:90.000000
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Spatial Coverage Map |
Documentation links not available. |
Publication Dates |
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Edition | First |
Dataset Progress Status | Under development - data is currently in the process of being created |
Data Update Frequency | Continual |
Purpose | Research - Radio Frequency Reflection |
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Theme keywords | NASA/GCMD Earth Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Place keywords | NASA/GCMD Location Keywords
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Project keywords | Global Change Master Directory (GCMD) Project Keywords
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Last Modified: 2015-09-18
For questions about the information on this page, please email:Justin.Mabie@noaa.gov