<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 02:50:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: F2x cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.02.25 (056) 02:50:00</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">
FF202605602250250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.229" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.291" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" 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="9.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="330.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" 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="290.106" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="250.722" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.144" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="57.723" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="15.283" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.078" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="55.770" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.220" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="153">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 220.000 225.000 230.000 230.000 230.000 230.000 230.000 225.000 225.000 230.000 230.000 230.000 230.000 225.000 227.500 230.000 230.000 235.000 236.875 238.750 240.625 242.500 244.375 246.250 248.125 250.000 255.000 255.000 257.500 260.000 259.286 258.571 257.857 257.143 256.429 255.714 255.000 255.000 255.000 255.000 250.000 250.000 255.000 250.000 250.000 247.500 245.000 245.000 245.000 245.000 255.000 250.000 255.000 256.667 258.333 260.000 260.000 260.000 265.000 270.000 270.000 270.000 272.500 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 290.000 295.000 292.500 290.000 295.000 296.250 297.500 298.750 300.000 301.250 302.500 303.750 305.000 300.000 295.000 290.000 285.000 280.000 275.000 277.500 280.000 280.000 280.000 280.000 280.000 285.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 312.500 315.000 320.000 320.000 320.000 325.000 327.500 330.000 330.000 335.000 340.000 340.000 345.000 350.000 350.000 360.000 370.000 370.000 370.000 371.424 374.120 381.180
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 66 0 69 0 66 72 0 69 0 69 66 0 57 57 60 66 75 69 69 72 75 0 0 66 0 0 0 0 0 0 0 0 0 0 0 66 60 60 0 51 0 0 0 0 51 0 57 0 57 60 69 66 60 54 0 0 69 0 57 0 0 63 66 0 0 57 63 57 0 60 60 60 0 60 57 51 57 54 54 60 54 0 0 60 57 54 60 57 0 60 57 0 0 0 48 57 54 57 60 0 60 0 0 0 75 66 69 0 75 75 75 66 54 0 0 72 75 75 75 72 72 72 75 78 63 66 72 66 63 60 69 63 60 69 57 0 63 66 66 63 66 60 66 57 0 48 60 0 54 54 51
</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 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 1.171875 1.171875 1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 -1.171875 -1.171875 0.390625 1.171875 -0.390625 -1.171875 0.390625 -1.171875 -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 1.171875 0.390625 -1.171875 0.390625 0.390625 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 1.953125 -1.171875 -1.171875 1.953125 1.953125 1.953125 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 0.390625 -1.171875 -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 -1.953125 -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 -1.953125 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="127">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 134.5 135.0 140.0 145.0 150.0 155.0 159.0 160.0 165.0 170.0 175.0 180.0 183.5 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 290.106 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.349 0.333 0.306 0.262 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.238 0.269 0.301 0.332 0.354 0.408 0.562 0.746 1.002 1.393 1.966 2.648 3.336 3.997 4.631 5.245 5.841 6.423 6.991 7.541 8.07 8.568 9.023 9.417 9.727 9.928 10.0 10.0 9.973 9.895 9.772 9.609 9.414 9.192 8.948 8.686 8.412 8.128 7.838 7.545 7.252 6.96 6.671 6.387 6.108 5.836 5.572 5.315 5.067 4.828 4.597 4.376 4.163 3.959 3.764 3.577 3.398 3.228 3.065 2.91 2.762 2.622 2.488 2.36 2.239 2.124 2.015 1.911 1.812 1.718 1.629 1.545 1.465 1.389 1.317 1.248 1.183 1.121 1.063 1.008 0.955 0.905 0.858 0.813 0.771 0.731 0.692 0.656 0.622 0.59 0.559 0.53 0.502 0.476 0.451 0.427 0.405 0.384 0.364 0.345 0.327 0.309 0.293 0.278 0.263 0.25 0.237 0.224 0.212 0.201

</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="10.0" PeakHeight="290.106" Num="5" zHalfNm="250.722" Error="4.202">
-113.662 6.623 3.062 -5.132 2.503
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="73.5" Depth="0.154"/>
<TopsideChapman PeakHeight="290.106" PeakDensity="1240694.8" PeakScaleHeight="29.078" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
