<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-07 -097 15:50:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="1 12 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 75% PACIFIC flags: Baseline built without F2 center</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.04.07 (097) 15:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202609704071550009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="9" >
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="24" Val="80.473" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="80.561" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="0.973" Name="yE" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.365" Units="MHz" ModelName="CCIR-79" />
<Modeled Name="foF1p" Val="4.349" Units="MHz" ModelName="IRI-90" />
<Modeled Name="foF2p" Val="7.868" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="E" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
80.473 80.812 81.166 81.536 81.923 82.328
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
9 0 0 0 0 15
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="3">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
79.574 80.0 80.561
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.7676172 2.16

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="1" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.16" PeakHeight="80.561" Num="3" Error="0.211">
-1.426 0.556 -0.117
</ShiftedChebyshev>
</ShiftedChebyshevList>
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
