<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 21:10:00.000"
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: 70% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, Unidentified traces above foF2</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" >
2026.04.01 (091) 21:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609104012110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.912" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.717" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="431.024" 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="0.930" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="337.767" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="290.372" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.542" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="69.422" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="21.018" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="34.289" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="78.450" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 276.111 277.222 278.333 279.444 280.556 281.667 282.778 283.889 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 291.667 293.333 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 296.667 298.333 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 306.667 308.333 310.000 310.000 315.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 320.000 320.000 321.667 323.333 325.000 326.667 328.333 330.000 331.250 332.500 333.750 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 367.500 370.000 370.000 370.000 370.000 372.500 375.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 407.500 410.000 410.000 415.000 415.000 415.000 415.000 417.500 420.000 422.500 425.000 425.000 425.973 427.206 428.820 431.024 434.213 439.240 448.333
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 66 0 0 66 0 66 63 60 60 0 0 0 57 60 66 0 0 69 0 72 0 0 0 60 0 0 66 66 0 0 0 63 72 0 0 0 0 57 0 63 66 72 69 72 72 69 0 0 72 72 60 0 0 69 69 69 0 69 69 0 0 72 69 60 0 69 72 0 60 0 69 72 0 72 0 63 48 72 0 63 0 48 0 54 63 69 69 72 60 0 69 0 72 60 0 72 66 63 66 69 0 75 66 69 54 78 66 69 72 75 66 69 54 60 66 69 69 60 69 72 75 66 72 57 63 69 72 63 66 69 60 66 66 57 63 66 66 63 66 66 0 66 63 63 63 60 60 57 63 54 60 0 45 0 54 0 48 57 54
</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 -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 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="152">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.352 95.0 100.0 105.0 110.0 115.0 120.0 125.0 128.812 130.0 135.0 140.0 145.0 147.624 150.0 155.0 160.0 165.0 166.436 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 337.767 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.619 0.806 0.9 0.93 0.914 0.867 0.781 0.682 0.682 0.682 0.682 0.682 0.682 0.713 0.779 0.845 0.911 0.93 1.052 1.193 1.327 1.465 1.61 1.767 1.938 2.125 2.332 2.559 2.806 3.075 3.362 3.664 3.98 4.305 4.638 4.976 5.318 5.663 6.011 6.362 6.715 7.072 7.433 7.798 8.167 8.54 8.916 9.294 9.667 10.021 10.325 10.519 10.55 10.546 10.506 10.429 10.318 10.177 10.01 9.821 9.613 9.39 9.155 8.91 8.657 8.399 8.138 7.876 7.613 7.352 7.093 6.838 6.586 6.34 6.098 5.863 5.633 5.41 5.193 4.983 4.78 4.583 4.394 4.21 4.034 3.864 3.7 3.542 3.391 3.245 3.106 2.972 2.843 2.72 2.601 2.488 2.379 2.275 2.175 2.08 1.989 1.901 1.817 1.737 1.661 1.587 1.517 1.45 1.386 1.324 1.266 1.21 1.156 1.105 1.056 1.009 0.964 0.921 0.88 0.841 0.804 0.768 0.734 0.701 0.67 0.64 0.612 0.585 0.559 0.534 0.51 0.487 0.466 0.445 0.425 0.406 0.388 0.371 0.354 0.338 0.323 0.309 0.295 0.282 0.27 0.258 0.246 0.235 0.225 0.215 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.93" PeakHeight="110.0" Num="3" Error="0.0">
-26.175 7.657 -1.13
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.93" EndFrequency="10.55" PeakHeight="337.767" Num="5" zHalfNm="290.372" Error="3.793">
-144.99 -38.937 16.561 -7.494 3.529
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="56.436" Depth="0.248"/>
<TopsideChapman PeakHeight="337.767" PeakDensity="1380924.4" PeakScaleHeight="34.289" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
