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Metadata

ASWS Casey Riometer

SPASE version 2.2.3

Numerical Data Product: Australian Space Weather Services Casey Riometer

Resource ID
spase://ASWS/NumericalData/Riometer/Cas_Riometer
Name
Australian Space Weather Services Casey Riometer
Alternate name
Description

A riometer (relative ionospheric opacity meter) (30 MHz) is an instrument used to quantify the amount of electromagnetic wave ionospheric absorption in the atmosphere.[1] As the name implies, a riometer measures the "opacity" of the ionosphere to radio noise emanating from distant stars and galaxies. In the absence of any ionospheric absorption, this radio noise, averaged over a sufficiently long period of time, forms a quiet-day curve. Increased ionization in the ionosphere will cause absorption of radio signals (both terrestrial and extraterrestrial), and a departure from the quiet-day curve. The difference between the quiet-day curve and the riometer signal is an indicator of the amount of absorption, and is measured in decibels. Riometers are generally passive radio antenna operating in the VHF radio frequency range (~30 MHz). The SWS WDC archives Riometer data obtained from Casey, Davis, Mawson and Macquarie Island in Antarctica. The first Riometer data file from Casey was obtained on 17/01/1989.

Additional information
World Data Centre: Data Display and Download: Riometer

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

Language
en
Documentation

includes descriptions of station, data formats and examples.

Language
en
Real Time Information: Real Time Riometer Data

Online viewer of real time Riometer data.

Language
en
Acknowledgement

We are thankful to the Australian Antarctic Division for the observations of Casey Riometer data.

Contact
Role Person
1. General contact spase://SMWG/Person/Kehe.Wang
2. Metadata contact spase://SMWG/Person/Kehe.Wang
Release date
2016-05-04 17:00:00
Repository
Name
spase://SMWG/Repository/SWS
Availability
Online
Access rights
Open
URL
FTP access to Riometer data

FTP access to the station Riometer data data of Casey and a README file.

Language
en
Format
Text
Encoding
None
Acknowledgement
Provider processing level
The Riometer data are processed data and are uncalibrated.
Instrument
spase://ASWS/Instrument/Ground/Casey/Riometer
Measurement type
Active waves
Temporal description
Start date
1989-01-17 00:00:00
Relative stop date
1 day ago
Note

The earliest Riometer data since 17/01/1989. Digital data are current to within a day.

Observed regions
Earth.NearSurface
Caveats
Keywords
Riometer

Parameters

Parameter #1

Name
Raw
Description

Cosmic noise intensity measured with a riometer.

Caveats
Cadence
10 seconds
Units
DU
Valid minimum
-2000
Valid maximum
2000
Quantity
Electromagnetic

Parameter #2

Name
QDC(quiet-day curve)
Description

A QDC is defined as the signal intensity that is observed with a quiet and undisturbed ionosphere. The QDC thus defined is subjected to seasonal and even shorter-term variations. A QDC determined for a given period is therefore only valid for that particular period of time.

Caveats
Cadence
10 seconds
Units
DU
Valid minimum
-2000
Valid maximum
2000
Quantity
Electromagnetic

Parameter #3

Name
Absorption
Description

Absorption = (QDC – Raw) / obliquity factor.

Caveats
Cadence
10 seconds
Units
dB
Valid minimum
-20
Valid maximum
20
Quantity
Electromagnetic
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