<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 08:10:00.000"
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: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.02.24 (055) 08:10:00</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">
FF202605502240810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="5.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.337" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.850" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.700" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="315.993" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="283.017" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="239.843" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.853" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="61.025" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.279" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="33.047" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="50.370" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="4.220" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="52">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 4.9 4.95 5.0 5.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 235.000 238.000 241.000 244.000 247.000 250.000 250.000 250.000 250.000 250.000 250.000 251.000 252.000 253.000 254.000 255.000 255.000 257.500 260.000 262.500 265.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 271.667 273.333 275.000 275.000 280.000 285.000 290.000 290.000 290.000 295.000 297.931 301.340 305.356 310.156 315.993 323.247 332.503 344.722 361.600 386.427 426.550
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 51 0 0 0 0 54 0 57 66 60 66 0 0 60 0 69 69 0 0 0 54 54 57 66 54 69 66 69 54 63 0 0 66 0 69 69 60 69 66 0 54 66 63 63 66 72 66 48 51 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 0.390625 0.390625 -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 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="122">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.167 140.0 145.0 150.0 155.0 160.0 165.0 168.333 170.0 175.0 180.0 185.0 190.0 195.0 197.5 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 283.017 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.35 0.34 0.321 0.292 0.25 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.209 0.235 0.262 0.288 0.314 0.341 0.354 0.426 0.583 0.768 1.002 1.316 1.765 2.39 3.052 3.585 3.987 4.292 4.528 4.709 4.847 4.946 5.011 5.044 5.05 5.048 5.029 4.99 4.934 4.863 4.778 4.683 4.578 4.465 4.347 4.224 4.097 3.969 3.839 3.708 3.578 3.449 3.321 3.196 3.072 2.952 2.834 2.719 2.608 2.5 2.395 2.294 2.196 2.102 2.011 1.923 1.839 1.758 1.681 1.606 1.535 1.466 1.4 1.337 1.277 1.219 1.164 1.112 1.061 1.013 0.967 0.923 0.881 0.84 0.802 0.765 0.73 0.697 0.665 0.634 0.605 0.577 0.551 0.525 0.501 0.478 0.456 0.435 0.415 0.396 0.378 0.36 0.344 0.328 0.313 0.298 0.285 0.271 0.259 0.247 0.236 0.225 0.214 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="5.05" PeakHeight="283.017" Num="5" zHalfNm="239.843" Error="1.309">
-102.325 26.636 -14.299 5.158 -0.687
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.5" Depth="0.154"/>
<TopsideChapman PeakHeight="283.017" PeakDensity="316408.2" PeakScaleHeight="33.047" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
