2.3.2 spase://ASWS/NumericalData/Ionogram/Cas_Ionogram Australian Space Weather Services Casey Ionogram 2021-03-29T17:14:50Z Ionograms are an image of frequency versus time delay (virtual height) of HF echoes from the ionosphere recorded by an ionosonde. An ionosonde is a swept frequency HF pulsed radar used to monitor the ionosphere. SWS WDC has archived ionogram data from 26 stations, 12 of them are still active at present. An CADI (Canadian Advanced Digital Ionosonde) ionosonde has been sounding since 30/11/1999 at Casey. The CADI vertical sounding ionosondes normally sweep in frequency from about 1 to 20 MHz. Three standard sweeps are provided: low resolution (100 frequencies), medium resolution (200 frequencies), high resolution (400 frequencies). The step size may be selected to be linear or logarithmic. The step interval is variable, becoming more coarse at higher frequencies as ionograms are generally displayed on a logarithmic scale. Height range up to 512 km (to be increased to 1000 km) with 6 km resolution. Every five minutes, a Ionogram data file is recorded, cleaned and the cleaned ionogram is transfered to SWS Sydney head office for autoscaling and further analysis. The raw ionogram file is recorded in a DVD monthly, which will be posted to Sydney SWS head office every month. During 07/02/1993 to 08/10/2001, Casey also had an Lowell ionosonde. SWS WDC archives all raw ionogram files and cleaned ionogram files. The Casey digital clean ionogram data is available since 25/11/1997, and digital raw ionogram data since 07/02/1993. The Casey scaled hourly ionospheric data include parameters of foF2, foF1, FoE, foEs, fbEs, fmin, fxl, f'scaling F/s, M(3000)F2, h'F2, h'F, h'E, h'Es, h'Scaling R/S and Type Es. They are avalable since 01/01/1957. The Casey median data of foF2 and M(3000)F2 are available since 07/1957. We are thankful to the Space Weather Network, Bureau of Meteorology of Australia for the observations of Casey ionogram data. spase://ASWS/Person/Kehe.Wang GeneralContact spase://ASWS/Person/Kehe.Wang MetadataContact Documentation (not with most browsers) https://downloads.sws.bom.gov.au/wdc/wdc_ion_archive/doc/ includes descriptions of data format of raw ionogram data and clean ionogram data en Software (not with most browsers) https://downloads.sws.bom.gov.au/wdc/wdc_tools/ionogram_viewers/ Softwares to view clean ionogram data with scaling function en spase://SMWG/Repository/SWS Online Open World Data Centre: Data Display and Download: Hourly Ionospheric Data https://www.sws.bom.gov.au/World_Data_Centre/1/3 includes browse display interface, button to get yearly data file and link to data availability chart en Text GZIP spase://SMWG/Repository/SWS Online Open World Data Centre: Data Display and Download: Monthly Median Ionospheric Data https://www.sws.bom.gov.au/World_Data_Centre/1/4 includes browse display interface, button to get the median data file and link to data availability chart en Text None spase://SMWG/Repository/SWS Online Open Real Time Display https://www.sws.bom.gov.au/HF_Systems/1/3 Online viewer of Real Time clean ionogram data en Binary None spase://SMWG/Repository/SWS Online Open Access to raw and clean ionogram data (not with most browsers) https://downloads.sws.bom.gov.au/wdc/wdc_ion_archive/ Access to the raw and clean ionogram data of Casey CADI ionosonde(cascd) and Lowell ionosonde(casey) en Binary ZIP The original ionogram data are raw data, they are then cleaned by reducing noise signals at the station. The manually scaled data is calibrated and the autoscaled data is uncalibrated. spase://ASWS/Instrument/Ground/Casey/Ionosonde Waves.Active 1957-01-01T00:00:00Z -P1D The earliest hourly ionospheric data since 01/01/1957. Digital clean ionogram data are current to within a day. RadioFrequency Earth.NearSurface.Ionosphere Ionogram Ionospheric data Ionosphere Median ionospheric data Hourly ionospheric data Scaled parameters Frequency Frequencies used to sonde ionopshere PT5M MHz Electromagnetic Directional Group Frequency RadioFrequency 1 20.0 MHz Virtual Height The apparent height of an ionospheric layer deduced from the time delay of a reflected radio pulse upon the assumption that it travelled at the speed of light over its entire path. However, the radio wave actually slows down as it is refracted so that the virtual height is greater than the true height of the refracting layer. PT5M Km 50 1000 Other