<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 14:00:00.000"
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 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" >
2026.01.31 (031) 14:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202603101311400009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.314" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.980" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="365.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="365.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.320" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.328" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="405.787" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="252.060" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.947" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="200.491" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.631" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="112.190" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="240.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.560" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="75">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
365.000 365.000 365.000 365.000 370.000 370.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 412.500 415.000 415.000 420.000 425.000 427.500 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 450.000 455.000 460.000 465.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 505.000 510.000 515.000 520.000 530.000 535.000 535.000 540.000 555.000 560.000 565.000 565.000 575.000 580.000 585.000 591.785 599.363 607.885 617.536 628.558 641.265 656.075 673.558 694.509 720.073 751.962 792.857
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54 0 48 54 48 54 54 54 54 54 51 57 0 57 57 57 57 54 57 57 60 60 0 57 54 60 57 0 57 51 57 54 60 57 54 63 60 60 60 60 60 60 57 57 54 57 54 57 57 60 60 48 54 57 60 45 51 54 57 60 60 60 63 60 60 57 57 54 54 54 48 45 45 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 -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 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.494 90.0 95.0 100.0 105.0 110.0 111.838 113.676 115.0 115.514 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 405.787 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.233 2.873 3.212 3.32 3.197 3.197 3.286 3.32 3.445 3.577 3.703 3.826 3.947 4.068 4.188 4.308 4.428 4.549 4.67 4.792 4.915 5.038 5.162 5.286 5.411 5.537 5.662 5.788 5.914 6.04 6.166 6.291 6.417 6.542 6.666 6.79 6.914 7.036 7.158 7.279 7.399 7.519 7.637 7.754 7.869 7.983 8.096 8.207 8.316 8.423 8.528 8.63 8.729 8.825 8.917 9.005 9.088 9.166 9.237 9.302 9.358 9.407 9.445 9.474 9.493 9.5 9.5 9.499 9.494 9.486 9.474 9.459 9.441 9.419 9.395 9.368 9.338 9.306 9.271 9.233 9.193 9.151 9.107 9.061 9.013 8.962 8.911 8.857 8.802 8.745 8.687 8.628 8.567 8.506 8.443 8.379 8.314 8.248 8.181 8.114 8.046 7.977 7.908 7.838 7.768 7.697 7.626 7.555 7.483 7.411 7.339 7.267 7.195 7.123 7.05 6.978 6.906 6.834 6.762 6.69 6.618 6.547 6.475 6.404 6.334 6.263 6.193 6.123 6.054 5.985 5.916 5.848 5.78 5.713 5.646 5.579 5.513 5.447 5.382 5.318 5.254 5.19 5.127 5.065 5.003 4.941 4.88 4.82 4.76 4.701 4.642 4.584 4.527 4.47 4.413 4.357 4.302 4.247 4.193 4.14 4.087 4.034 3.982 3.931 3.88 3.83 3.78 3.731 3.683 3.635 3.587 3.54 3.494 3.448 3.403 3.358 3.314 3.27 3.227 3.184 3.142 3.1 3.059 3.018 2.978 2.938

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.32" PeakHeight="110.0" Num="3" Error="0.0">
-30.45 13.076 -3.132
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.32" EndFrequency="9.5" PeakHeight="405.787" Num="5" zHalfNm="252.06" Error="3.936">
-266.532 -36.048 14.243 -3.23 1.294
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.514" Depth="0.123"/>
<TopsideChapman PeakHeight="405.787" PeakDensity="1119727.0" PeakScaleHeight="112.19" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
