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Metadata

ASWS Davis Ionogram

SPASE version 2.2.3

Numerical Data Product: Australian Space Weather Services Davis Ionogram

Resource ID
spase://ASWS/NumericalData/Ionogram/Dav_Ionogram
Name
Australian Space Weather Services Davis Ionogram
Alternate name
Description

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 30 stations, 12 of them are still active at present. An Lowell Digisonde-Portable-Sounder-4D (DPS4D) has been sounding since 18/12/2001 at Davis. The Lowell vertical sounding ionosondes normally sweep in frequency from about 0.5 to 30 MHz. Frequency step is selectable to 1kHz. The step interval is variable, becoming more coarse at higher frequencies as ionograms are generally displayed on a logarithmic scale. Every ten 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 02/06/1994 to 06/01/2000, Davis also had an IPS 4D ionosonde, and during 07/02/2000 to 01/12/2001, an IPS 5D ionosonde. SWS WDC archives all raw ionogram files and cleaned ionogram files. The Davis digital clean ionogram data is available since 01/08/1994, and digital raw ionogram data since 02/06/1994. The Davis 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 01/01/1985. The Davis median data of foF2 and M(3000)F2 are available since 03/1985.

Additional information
World Data Centre: Data Display and Download: Hourly Ionospheirc Data

includes browse display interface, button to get yearly data file and link to data availability chart

Language
en
World Data Centre: Data Display and Download: Monthly Median Ionospheirc Data

includes browse display interface, button to get the median data file and link to data availability chart

Language
en
Documentation

includes descriptions of data format of raw ionogram data and clean ionogram data

Language
en
Software

Softwares to view clean ionogram data with scaling function

Language
en
Real Time Display

Online viewer of Real Time clean ionogram data

Language
en
Acknowledgement

We are thankful to the Space Weather Network, Bureau of Meteorology of Australia for the observations of Davis ionogram data.

Contact
Role Person
1. General contact spase://SMWG/Person/Kehe.Wang
2. Metadata contact spase://SMWG/Person/Kehe.Wang
Release date
2016-06-21 17:00:00
Repository
Name
spase://SMWG/Repository/SWS
Availability
Online
Access rights
Open
URL
FTP access to raw and clean ionogram data

FTP access to the raw and clean ionogram data of Davis IPS 4D (dav4d), and IPS 5D (dav5d) ionosondes and Lowell ionosonde (davis)

Language
en
Format
Binary
Encoding
None
Acknowledgement
Provider processing level
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.
Instrument
spase://ASWS/Instrument/Ground/Davis/Ionosonde
Measurement type
Active waves
Temporal description
Start date
1985-01-01 00:00:00
Relative stop date
1 day ago
Note

The earliest hourly ionospheric data since 01/01/1985. Digital clean ionogram data are current to within a day.

Spectral range
RadioFrequency
Observed regions
Earth.NearSurface.Ionosphere
Caveats
Keywords
Hourly ionospheric data
Ionogram
Ionosphere
Ionospheric data
Median ionospheric data
Scaled parameters

Parameters

Parameter #1

Name
Frequency
Description

Frequencies used to sonde ionopshere

Caveats
Cadence
10 minutes
Units
MHz
Wave type
Electromagnetic
Quantity
Frequency
Qualifier
Directional
Group
Frequency range
Spectral range
RadioFrequency
Low frequency
0.5
High frequency
30.0
Units
MHz

Parameter #2

Name
Virtual Height
Description

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. Lowell DPS4D height range is 0-1200KM ( 0 KM used for self-calibration).

Caveats
Cadence
10 minutes
Units
Km
Valid minimum
0.0
Valid maximum
1200
Quantity
Other
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