<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 13:30:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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" >
2026.04.02 (092) 13:30:00</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">
FF202609204021330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="12.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.529" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.480" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.410" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.450" 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="24" Val="111.624" Name="h`E" 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="11.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="496.667" 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="3.310" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.323" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="373.735" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="260.554" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.886" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="152.703" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="65.535" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="84.406" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="174.610" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.650" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="152">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 215.000 220.000 225.000 225.000 231.250 237.500 243.750 250.000 255.000 260.000 265.000 267.500 270.000 275.000 280.000 285.000 287.500 290.000 292.500 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 317.500 320.000 320.000 325.000 325.000 325.000 325.000 330.000 332.500 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 362.500 365.000 365.000 365.000 365.000 367.500 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 385.000 382.500 380.000 385.000 390.000 390.000 390.000 395.000 395.000 397.500 400.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 435.000 435.000 435.000 435.000 435.000 437.500 440.000 445.000 450.000 450.000 455.000 455.000 460.000 462.500 465.000 467.500 470.000 472.500 475.000 480.000 482.500 485.000 490.000 493.333 496.667 500.000 505.000 512.500 518.351 524.762 531.817 539.618 548.291 557.990 568.909 581.293 595.458 611.819 630.929 653.544 680.725
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 48 45 0 0 0 45 45 48 54 0 48 51 54 51 0 45 0 51 0 0 54 51 51 51 51 51 0 54 54 0 0 54 57 57 57 57 60 48 0 63 60 60 63 63 63 57 0 48 48 0 60 60 60 60 54 57 60 60 57 60 60 54 57 60 51 0 57 60 57 0 45 51 60 63 0 54 60 51 57 60 63 60 63 57 0 69 60 69 69 72 69 66 63 69 60 63 66 63 66 57 60 48 54 60 54 54 45 54 42 45 0 54 51 0 51 54 48 51 48 54 48 0 48 0 0 0 48 45 0 45 45 0 0 42 45 0 45 45 0 45 0 0 0 0 0 0 0 0 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 -0.390625 1.171875 -1.953125 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 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 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 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 2.734375 0.390625 0.390625 -2.734375 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -1.953125 -0.390625 0.390625 0.390625 -1.953125 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 -1.171875 -1.171875 -0.390625 0.390625 -1.953125 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.3 3.35 3.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
111.624 113.288 115.566
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -2.734375 -0.390625
</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" >
89.481 90.0 95.0 100.0 105.0 110.0 111.879 113.759 115.0 115.638 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 373.735 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.294 2.951 3.299 3.41 3.284 3.284 3.367 3.41 3.543 3.688 3.828 3.966 4.104 4.242 4.382 4.525 4.67 4.819 4.972 5.129 5.291 5.457 5.629 5.806 5.988 6.176 6.369 6.567 6.769 6.976 7.186 7.4 7.616 7.835 8.055 8.275 8.496 8.717 8.936 9.154 9.37 9.584 9.794 10.001 10.203 10.401 10.593 10.778 10.957 11.127 11.287 11.437 11.574 11.697 11.805 11.895 11.965 12.015 12.044 12.05 12.05 12.044 12.03 12.008 11.979 11.944 11.901 11.853 11.798 11.738 11.672 11.601 11.526 11.446 11.362 11.273 11.182 11.086 10.988 10.887 10.783 10.676 10.567 10.456 10.344 10.23 10.114 9.997 9.879 9.76 9.64 9.519 9.398 9.277 9.155 9.033 8.911 8.79 8.668 8.547 8.425 8.305 8.185 8.065 7.946 7.828 7.711 7.594 7.479 7.364 7.25 7.137 7.025 6.915 6.805 6.697 6.589 6.483 6.378 6.274 6.172 6.07 5.97 5.871 5.774 5.677 5.582 5.488 5.396 5.305 5.215 5.126 5.038 4.952 4.867 4.784 4.701 4.62 4.54 4.461 4.383 4.307 4.232 4.158 4.085 4.013 3.943 3.873 3.805 3.738 3.672 3.607 3.543 3.48 3.418 3.357 3.297 3.238 3.181 3.124 3.068 3.013 2.959 2.906 2.854 2.802 2.752 2.703 2.654 2.606 2.559 2.513 2.468 2.423 2.379 2.336 2.294 2.252 2.212 2.172 2.132 2.094 2.056 2.018 1.982 1.946

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.41" PeakHeight="110.0" Num="3" Error="0.0">
-30.514 13.172 -3.177
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.41" EndFrequency="12.05" PeakHeight="373.735" Num="5" zHalfNm="260.554" Error="5.073">
-227.083 -35.89 4.801 -1.744 1.819
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.638" Depth="0.126"/>
<TopsideChapman PeakHeight="373.735" PeakDensity="1801519.9" PeakScaleHeight="84.406" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
