<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 08:50:00.000"
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="2 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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" >
2026.02.24 (055) 08:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605502240850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="4.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.298" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.995" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="319.920" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.772" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="279.027" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="228.077" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.973" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="72.344" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.753" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="38.960" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="64.070" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.260" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="51">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 235.000 237.000 239.000 241.000 243.000 245.000 245.000 240.000 241.000 242.000 243.000 244.000 245.000 250.000 251.667 253.333 255.000 255.000 255.000 255.000 255.000 260.000 260.000 261.667 263.333 265.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 285.000 286.770 288.744 290.962 293.471 296.332 299.625 303.456 307.968 313.361 319.920 328.071 338.471 352.201 371.167 399.067 444.158
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 63 0 0 0 0 57 60 63 0 0 0 0 63 66 0 0 63 66 69 0 72 78 81 0 0 66 60 51 0 0 69 66 69 66 0 0 0 78 60 63 0 0 54 60 60 60 54 0 0 0
</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 -1.953125 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -1.171875 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.171875 -1.953125 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="134">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.604 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 133.577 135.0 140.0 145.0 150.0 155.0 157.153 160.0 165.0 170.0 175.0 180.0 180.73 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 279.027 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.513 0.669 0.747 0.772 0.76 0.723 0.657 0.553 0.437 0.437 0.437 0.437 0.437 0.437 0.437 0.477 0.548 0.62 0.691 0.762 0.772 0.892 1.059 1.259 1.498 1.782 2.112 2.479 2.859 3.223 3.55 3.834 4.074 4.275 4.441 4.575 4.68 4.759 4.812 4.843 4.85 4.85 4.839 4.815 4.777 4.728 4.669 4.601 4.525 4.442 4.354 4.261 4.163 4.063 3.96 3.856 3.75 3.644 3.538 3.432 3.327 3.222 3.119 3.018 2.918 2.82 2.724 2.631 2.539 2.45 2.363 2.279 2.197 2.117 2.04 1.965 1.892 1.822 1.754 1.688 1.625 1.564 1.505 1.447 1.392 1.339 1.288 1.239 1.191 1.145 1.101 1.059 1.018 0.978 0.94 0.904 0.869 0.835 0.803 0.771 0.741 0.712 0.685 0.658 0.632 0.607 0.584 0.561 0.539 0.518 0.498 0.478 0.459 0.441 0.424 0.407 0.391 0.376 0.361 0.347 0.334 0.32 0.308 0.296 0.284 0.273 0.262 0.252 0.242 0.233 0.223 0.215 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.772" PeakHeight="110.0" Num="3" Error="0.0">
-25.216 6.699 -0.879
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.772" EndFrequency="4.85" PeakHeight="279.027" Num="5" zHalfNm="228.077" Error="1.328">
-109.795 18.534 -8.768 2.002 -0.27
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="70.73" Depth="0.335"/>
<TopsideChapman PeakHeight="279.027" PeakDensity="291842.44" PeakScaleHeight="38.96" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
