<?xml version="1.0" encoding="UTF-8"?>
<Instrument 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>Instrument_DopplerSounder</localID>
<namespace>iap-p</namespace>
<version>1</version>
<creationDate>2022-09-14T12:00:00Z</creationDate>
<lastModificationDate>2022-09-14T12:00:00Z</lastModificationDate>
</PITHIA_Identifier>
</identifier>
<name>Multipoint Continuous Doppler sounding system</name>
<description>
A vertically-propagating radio wave reflects at the height where its frequency matches the local plasma
frequency, which is determined by the electron density. It can be used for an investigation of
infrasound, acoustic gravity waves (AGWs), geomagnetic fluctuations etc.
</description>
<type xlink:href="https://metadata.pithia.eu/ontology/2.2/instrumentType/Radar"/>
<operationalMode>
<InstrumentOperationalMode>
<id>sounding</id>
<name>Active sounding</name>
<description>
The continuous Doppler sounding is based on the measurement of Doppler shift, which experience the radio waves that reflect from the ionosphere.
</description>
</InstrumentOperationalMode>
</operationalMode>
</Instrument>
