<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 08:40:00.000"
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="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2x cusp not found, One of F2 cusps was derived from the other</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" >
2026.02.20 (051) 08:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202605102200840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="3.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.611" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="12.459" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="3.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="3.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="290.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.606" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="249.196" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="218.999" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.662" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="42.786" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="1.450" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="23.007" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="39.370" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.860" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="30">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 231.111 232.222 233.333 234.444 235.556 236.667 237.778 238.889 240.000 241.250 242.500 243.750 245.000 250.000 250.000 250.000 250.000 255.000 255.000 260.000 260.000 265.000 270.000 270.000 280.000 285.000 290.000 302.426 326.569
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 0 0 0 0 0 0 0 60 0 57 0 69 60 0 72 72 69 72 69 69 69 72 69 69 69 69 66 69
</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 -0.390625 2.734375 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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="86">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.08 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.44 140.0 145.0 150.0 155.0 160.0 162.88 165.0 170.0 175.0 180.0 185.0 189.32 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 249.196 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.402 0.525 0.587 0.606 0.597 0.571 0.525 0.452 0.334 0.283 0.283 0.283 0.283 0.283 0.283 0.283 0.309 0.37 0.431 0.492 0.553 0.606 0.631 0.831 1.075 1.38 1.747 2.141 2.509 2.819 3.062 3.242 3.364 3.432 3.45 3.45 3.43 3.383 3.314 3.227 3.126 3.014 2.895 2.771 2.644 2.516 2.388 2.263 2.14 2.021 1.906 1.795 1.689 1.588 1.492 1.401 1.314 1.232 1.155 1.082 1.013 0.949 0.888 0.831 0.778 0.727 0.68 0.636 0.595 0.556 0.52 0.486 0.454 0.425 0.397 0.371 0.347 0.324 0.303 0.283 0.265 0.247 0.231 0.216 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.606" PeakHeight="110.0" Num="3" Error="0.0">
-23.739 5.414 -0.595
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.606" EndFrequency="3.45" PeakHeight="249.196" Num="5" zHalfNm="218.999" Error="0.267">
-64.802 7.761 -3.664 0.849 -0.02
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="79.32" Depth="0.323"/>
<TopsideChapman PeakHeight="249.196" PeakDensity="147673.7" PeakScaleHeight="23.007" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
