SWS Ionospheric Scintillation Monitor Data (1999 onwards)

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Data Summary

Title: SWS Ionospheric Scintillation Monitor Data (1999 onwards)
Status: onGoing
Start Time: 1999-08-20
End Time: now
Geographical Extent (deg):
West: 129
East: 191
South: -55
North: -2

Data Details

Abstract

Ionospheric scintillation is a rapid fluctuation of radio-frequency signal phase and/or amplitude, which is 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 Vanimo was installed in 20/08/1999. Data frequency: Daily file;
Supplementary Information:
Documentation about Ionospheric Scintillation Monitor data format [ http://www.sws.bom.gov.au/Satellite/6/3 ]. ~~~~~~~~~~~~~~~~~~~~~~~ Parameters ++++++++++++++++++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. Caveats Cadence : 1 minute ; Units : S4 Final (Ionospheric Amplitude Scintillation Index) ; Valid minimum : 0.000000 ; Valid maximum : 1.000000 ; Quantity : Electromagnetic ; ++++++++++++++++++Parameter #2 Name : Sigma60 ; Description : Phase scintillation is quantified by the Prms (or ?rms) 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. Caveats Cadence : 1 minute ; Units : Sigma60 (Ionospheric Phase Scintillation Index) ; Valid minimum : 0.000000 ; Valid maximum : 1.000000 ; Quantity : Electromagnetic ; ~~~~~~~~~~~~~~~~~~~~~~~
Purpose:
This Ionospheric scintillation monitor dataset supports the Bureau's Space Weather Services ( SWS ) Program.
Keywords: (Type: theme)
  • Ionospheric Scintillation Monitor
  • DataType-Observations
  • MeasurementType-Waves.Active
  • Space Weather
  • DataParam-Waves.Active
  • Instrument-Ionospheric_Scintillation_Monitor
  • ISM
  • Ionospheric Scintillation Monitor
Keywords: (Type: place)
  • Observed regions-Earth.NearSurface.Ionosphere
  • S4 Scintillation index
Keywords: (Type: theme; Thesaurus: GCMD science keywords)
  • Earth Science | Sun-Earth Interactions | Ionosphere/Magnetosphere Dynamics

Citation Details

Title: SWS Ionospheric Scintillation Monitor Data (1999 onwards)
Resource Date: 2017-07-04T04:00:00 (creation)
Identifier:
Code: http://www.bom.gov.au/metadata/19115/ANZCW0503900487
Party To Be Cited:
Organisation: Australian Bureau of Meteorology
Role: originator
Credit: We are grateful to the SWN for the observations of Ionospheric scintillation monitor data.

Point Of Contact For Dataset

Point Of Contact: WDC Manager, WDC manager; Space Weather Services, Australian Bureau of Meteorology
Email: sws_wdc@bom.gov.au
Web: Bureau of Meteorology Space Weather World Data Centre website. [http://www.sws.bom.gov.au/World_Data_Centre] (WWW:LINK-1.0-http--link) , Function: information
Custodian: WDC Manager, WDC manager; Space Weather Services, Australian Bureau of Meteorology
Owner: Australian Bureau of Meteorology

Data Extent

Extent Description: Map of all stations: [ http://www.sws.bom.gov.au/World_Data_Centre/2/1/1 ]. Ionospheric scintillation stations: Darwin ............. [Lat. -12.45 Long. 130.95E]; Macquarie Island .... [Lat. -54.50 Long. 158.95E] Niue ............. [Lat. -19.07 Long. 190.07E]; Vanimo, PNG ..... [Lat. -2.70 Long. 141.30E] - closed 2009.07; Weipa ............. [Lat. -12.63 Long. 141.88E]; Willis Island ..... [Lat. -16.29 Long. 149.97E];
Geographical Extent (deg):
West Bound Longitude: 129
East Bound Longitude: 191
South Bound Latitude: -55
North Bound Latitude: -2
Temporal Extent:
Start Time: 1999-08-20
End Time: now
Description: 1999-08-20 to now

Dataset Constraints

Dataset Legal Constraints:
Use Constraints: copyright; otherRestrictions
Use Limitation: The Ionospheric Scintillation Monitor data has had very limited quality control.
Other Constraints: DATA LICENCE: Data resources freely available from the Bureau of Meteorology website and ftp site, which are described in this metadata record are licensed under the Bureau's "Default terms of use", which are explained at the following url [ http://www.bom.gov.au/other/copyright.shtml ]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ATTRIBUTION: We request that attribution is "Australian Bureau of Meteorology (date), (Title), [ http://www.bom.gov.au/metadata/19115/ANZCW0503900487 ]; Downloaded from [url] on [date-of-download]. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DISCLAIMER: Please refer to [ http://www.bom.gov.au/other/disclaimer.shtml ] for disclaimer details. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Data Information

Data Distribution Information

DownloadableData : Daily Ionospheric Scintillation Monitor data from 6 stations (& link to data availability chart). [http://www.sws.bom.gov.au/World_Data_Centre/1/11/] (WWW:LINK-1.0-http--link) , Function: download
Real time Ionospheric Scintillation Monitor data, from all 5 "open" stations. [http://www.sws.bom.gov.au/Satellite/1/1] (WWW:LINK-1.0-http--link) , Function: information
DownloadableData : FTP access to the station Ionospheric Scintillation Monitor data. [ftp://ftp-out.sws.bom.gov.au/wdc/wdc_ism/] (WWW:DOWNLOAD-1.0-ftp--download) , Function: download
Background on Ionospheric Scintillation [http://www.sws.bom.gov.au/Satellite/6/3] (WWW:LINK-1.0-http--link) , Function: information
SPASE metadata records [SPASE format], per station/data-type [http://www.sws.bom.gov.au/World_Data_Centre/3/1/] (WWW:LINK-1.0-http--link)
Point of truth URL of this metadata record (19115) [http://www.bom.gov.au/metadata/19115/ANZCW0503900487] (www link) , Function: information

Data Quality

Scope:
Level: dataset
Lineage:
Statement: The Ionospheric Scintillation Monitor data are processed data, and are uncalibrated. The Ionospheric Scintillation Monitor data has had very limited quality control.
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Metadata Information

Metadata Identifier: ANZCW0503900487
Hierarchy Level: dataset
Hierarchy Level Name: Data Asset Audit record