<?xml version="1.0" encoding="UTF-8"?>
<ComputationCapabilities xmlns="https://metadata.pithia.eu/schemas/2.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="https://metadata.pithia.eu/schemas/2.2 https://metadata.pithia.eu/schemas/2.2/pithia.xsd">
<identifier>
<PITHIA_Identifier>
<localID>ComputationCapabilities_GNSS_Amplitude_Scintillation_Indices_50hz_eSWua</localID>
<namespace>ingv</namespace>
<version>1</version>
<creationDate>2023-02-22T10:40:00Z</creationDate>
<lastModificationDate>2023-05-08T12:40:00Z</lastModificationDate>
</PITHIA_Identifier>
</identifier>
<name>eSWua: Amplitude Scintillation Index (S4) computed from 50 Hz GNSS signal samples</name>
<description>
The slant Amplitude Scintillation Index (s4_slant) is calculated as the standard deviation
of the 50 Hz raw signal power samples normalized to the average signal power over an
interval of 60 seconds for each available GNSS satellite link and signal frequencies
(depending on the acquisition capabilities of the receiver). The 1-min resolution s4_slant
is corrected taking into account the thermal noise contribution of the receiver and the
vertical Amplitude Scintillation Index (s4_vert) are estimated according to formula (4) of
Spogli et al. (2014, http://dx.doi.org/10.1016/j.jastp.2013.10.003), by assuming the
Ionospheric Pierce Point at an altitude of 350 km.
</description>
<capabilities>
<processCapability>
<!-- this name is used for internal purposes by the Observation XML file (result
section) to point/link to this specific capability. Do not use any space characters! -->
<name>s4_slant</name>
<observedProperty xlink:href="https://metadata.pithia.eu/ontology/2.2/observedProperty/WaveAmplitudeVariation"/> <!--
link to the Observed Property controlled vocabulary -->
<dimensionalityInstance xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityInstance/1DPoints"/>
<dimensionalityTimeline xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityTimeline/1DTimeseries"/>
</processCapability>
<processCapability>
<!-- this name is used for internal purposes by the Observation XML file (result
section) to point/link to this specific capability. Do not use any space characters! -->
<name>s4_vert</name>
<observedProperty xlink:href="https://metadata.pithia.eu/ontology/2.2/observedProperty/WaveAmplitudeVariation"/> <!--
link to the Observed Property controlled vocabulary -->
<dimensionalityInstance xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityInstance/1DPoints"/>
<dimensionalityTimeline xlink:href="https://metadata.pithia.eu/ontology/2.2/dimensionalityTimeline/1DTimeseries"/>
</processCapability>
</capabilities>
<dataLevel xlink:href="https://metadata.pithia.eu/ontology/2.2/dataLevel/L2A"/>
<type xlink:href="https://metadata.pithia.eu/ontology/2.2/computationType/AmplitudeScintillationIndexS4"/>
<version/>
<softwareReference/>
<processingInput/>
<algorithm/>
</ComputationCapabilities>
