gov.noaa.ngdc.stp.ionosonde:G00004User ServicesDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce19730101The ionosphere is that part of the Earth's atmosphere that results mainly from the ionizing effect of Solar electromagnetic radiation. For poleware latitudes, the ionizing effect of incident energetic particles is also significant. Traditionally, the following ionospheric regions and their approximate height ranges have been designated: D region (60-90 km); E region (90-150 km); F1 region (150-250 km); and F2 region (above 250 km). Ionosondes utilize the radio wave-reflecting properties of the ionosphere. The product of the speed of light in a vacuum and half the elapsed time between vertical transmission of a single frequency electromagnetic wave and reception of the reflected wave at the transmitting location is defined as the virtual height of that frequency. A sweep-frequency ionogram is a plot of virtual height versus frequency and is recorded as nearly instantaneously as possible. These ionospheric data consists mainly of hourly values for at least one to a maximum of all of the following ionospheric characteristics (parameters). They are foF2, M(3000)F2, hF2, foF1, M(3000)F1, hF, foE, hE, foE2, hE2, foEs, fbEs, hEs, fmI, and fxI. The values are five byte (character) fields. The first three bytes of the field are reserved for a numeric value; the last two bytes are reserved for the qualifying and descriptive letter, if present. There are no decimals encoded in these data. Documentation is supplied with each data order. Data are archived on CDROM, optical disk, and magnetic tape. There are two CD-ROM's sold as a set. One contains 1957 - 1975 data; the other contains 1976-1990 data. The CDROM contains ASCII files and runs on DOS-compatible machines. A catalog, which lists the contents of the CDROM data set, is available via anonymous FTP.ngdc.noaa.gov and GOPHER.ngdc.noaa.gov in the /STP/IONOSPHERE/CATALOG directory. Additional data are available, but have not yet been put on CDROM. Data are also available on magnetic tape and IBM compatible diskette. U.S. Department of Commerce NOAA, NESDIS E/GC2 National Geophysical Data Center and World Data Center - A 325 Broadway Boulder, CO 80303-3328 USA FAX:303-497-6513 Internet:info@mail.ngdc.noaa.gov Phone:303-497-6414 Raymond O. ConkrightIonospheric Research19420101UnknownUnknownIn workmonthly-180.000000180.00000090.000000-90.000000NASA/GCMD Earth Science KeywordsEARTH SCIENCE > Solar-terrestrial Interactions > Ionosphere/Magnetosphere Particles > Particle DensityUncontrolled KeywordsIonosondeIonospheric ParametersNASA/GCMD Data Center KeywordsWDC/STP, BOULDER > World Data Center for Solar-Terrestrial Physics, BoulderDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceNASA/GCMD Location KeywordsGlobalRestriction Code: otherRestrictions; Use Limitation: Disclaimer 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 failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.; Other: Use Constraints: None; Other: Access Constraints: No Constraints; DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of CommerceJustin Mabiephysical and mailing NOAA/NESDIS/NGDC E/GC1 325 Broadway BoulderCO80305-3328(303) 497-6135justin.mabie@noaa.govUnknown 20100917Justin MabieDOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commercemailing and physical 325 Broadway, Mail Code E/GC4 BoulderCO80305-3328(303) 497-6135Justin.Mabie@noaa.govContent Standard for Digital Geospatial Metadata: Extensions for Remote Sensing MetadataFGDC-STD-012-2002