Photographic Records Showing the Variations of the Virtual Height of Reflection as a Function of the Radio FrequencyBack to Collection NOAA/NESDIS/NGDC/STP/Ionosonde
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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 (...etc)

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https://www.ngdc.noaa.gov/stp/
ftp://ftp.ngdc.noaa.gov/ionosonde/
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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 teleph (...etc)

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While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the (...etc)

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