2.3.2 spase://ASWS/NumericalData/Ionogram/Tvl_Ionogram Australian Space Weather Services Townsville 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 IPS 5D ionosonde has been sounding since 17/08/2000 at Townsville. The 5D vertical sounding ionosondes normally sweep in frequency from about 1 to 21.5 MHz. Frequency step resolution for the 5D is 5kHz, with up to 4095 steps available. The step interval is variable, becoming more coarse at higher frequencies as ionograms are generally displayed on a logarithmic scale. 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 13/05/1994 to 19/12/2001, Townsville also had an IPS 4D ionosonde. During 01/01/1991 to 03/09/1998, an IPS 5a ionosonde. and During 03/09/1998 to 15/08/2000, a CADI ionosonde. The IPS 5D ionosonde was stopped in 10/09/2018 and replaced by an IPS 5F ionosonde since 09/01/2019. SWS WDC archives all raw ionogram files and cleaned ionogram files. The Townsville digital clean ionogram data is available since 01/01/1991, and digital raw ionogram data since 13/05/1994. The Townsville 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 09/06/1951. The Townsville median data of foF2 and M(3000)F2 are available since 06/1946. We are thankful to the Space Weather Network, Bureau of Meteorology of Australia for the observations of Townsville 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 Ionospheirc 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 Ionospheirc 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 Townsville IPS 4D (tvl4d), 5A (tvl5a) and IPS 5D (tvl5d) ionosondes and CADI ionosonde (tvlcd) 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/Townsville/Ionosonde Waves.Active 1946-06-01T00:00:00Z -P1D The earliest median ionospheric data since 06/1946. 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 21.5 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