Version:2.3.2
NumericalData
ResourceID
spase://ASWS/NumericalData/Ionospheric_Scintillation_Monitor/Mac_Ionospheric_Scintillation_Monitor
ResourceHeader
ResourceName
Australian Space Weather Services Macquarie Island Ionospheric Scintillation Monitor
ReleaseDate
2021-03-29 17:14:50Z
Description
Ionospheric scintillation is a rapid fluctuation of radio-frequency signal phase and/or amplitude, generated as a signal passes through the ionosphere. Scintillation occurs when a radio frequency signal in the form of a plane wave traverses a region of small scale irregularities in electron density. The irregularities cause small-scale fluctuations in refractive index and subsequent differential diffraction (scattering) of the plane wave producing phase variations along the phase front of the signal. As the signal propagation continues after passing through the region of irregularities, phase and amplitude scintillation develops through interference of multiple scattered signals. The first Ionospheric Scintillation Monitor in Macquarie Island was installed in 20/03/2008. There is no data between 01/10/2009 and 01/12/2011.
Acknowledgement
We are thankful to the Space Weather Network, Bureau of Meteorology of Australia for the observations of Macquarie Island Ionospheric Scintillation Monitor data.
Contacts
InformationURL
Name
Documentation
URL
Description
includes descriptions of station logfiles, data formats and examples and hardware
Language
en
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
World Data Centre: Data Display and Download: Ionospheric Scintillation Monitor
URL
Style
Search
Description
includes browse display interface, button to get daily data file and link to data availability chart
Language
en
AccessURL
Name
Real Time Information
URL
Style
Overview
Description
Online viewer of real time Ionospheric Scintillation Monitor data, Latest Conditions, Regional Map, Recent Scintillation Events.
Language
en
AccessURL
Name
Access to Ionospheric Scintillation Monitor data (not with most browsers)
URL
Style
Listing
Description
Access to the station Ionospheric Scintillation Monitor data data of Macquarie Island.
Language
en
Format
Text
Encoding
None
ProviderProcessingLevel
The Ionospheric Scintillation Monitor data are processed data and are uncalibrated.
InstrumentIDs
MeasurementType
Waves.Active
TemporalDescription
TimeSpan
StartDate
2008-03-20 00:00:00Z
RelativeStopDate
-P1D
Note
The earliest Ionospheric Scintillation Monitor data since 20/08/2008. Digital data are current to within a day.
ObservedRegion
Earth.NearSurface.Ionosphere
Keywords
Ionospheric Scintillation Monitor
ISM
GPS
Ionosphere
Parameter #1
Name
S4 Final
Description
S4 is a dimensionless number with a theoretical upper limit of 1.0, commonly estimated over an interval of 60 seconds.
There are two defined regimes of amplitude scintillation: weak and strong, which roughly correspond to the type of scattering associated with each. Strong scintillation is generally considered to occur when S4 is greater than ~0.6 and is associated with strong scattering of the signal in the ionosphere. Below this is weak scintillation. An S4 level below 0.3 is unlikely to have a significant impact on GPS.
Cadence
PT60S
Units
S4 Final (Ionospheric Amplitude Scintillation Index)
ValidMin
0.000000
ValidMax
1.000000
Field
FieldQuantity
Electromagnetic
Parameter #2
Name
Sigma60
Description
Phase scintillation is quantified by the Prms (or Φrms) index which is defined as the standard deviation of the signal phase over a given time interval. This index is measured either in radians or degrees. A Prms greater than ~ 1° is considered to be strong scintillation. At mid-latitudes, Prms rarely exceeds 1° for more than 1% of the time.
Cadence
PT60S
Units
Sigma60 (Ionospheric Phase Scintillation Index)
ValidMin
0.000000
ValidMax
1.000000
Field
FieldQuantity
Electromagnetic
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