<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-09 -040 10:20:00.000"
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 0 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" >
2026.02.09 (040) 10:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202604002091020009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="8.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.152" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.476" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.300" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.150" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="111.123" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="136.667" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="101.129" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.948" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="340.000" 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="2.293" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="281.944" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="212.522" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.502" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="97.155" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="20.644" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.747" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="96.490" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="98">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 240.000 240.000 240.000 240.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 270.000 267.500 265.000 270.000 270.000 270.000 270.000 271.667 273.333 275.000 275.000 275.000 275.000 276.250 277.500 278.750 280.000 281.250 282.500 283.750 285.000 285.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 315.000 315.000 320.000 320.000 325.000 325.000 330.000 330.000 335.000 340.000 340.000 340.000 350.000 353.445 357.452 362.172 367.813 374.675 383.201 394.080 408.445 428.286 457.475 504.655
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 63 63 60 0 54 63 66 66 66 63 66 72 69 69 69 66 63 66 66 66 60 63 60 63 66 69 72 72 69 69 69 0 66 0 0 69 69 0 75 75 0 0 69 72 72 72 0 66 0 0 0 0 0 63 63 54 57 0 60 51 60 60 66 69 69 72 57 63 69 72 72 72 75 72 75 69 72 69 72 69 69 69 63 72 72 72 69 66 69 72 66 66 63 66 63 57 48
</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 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>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
111.123 112.107 113.250 114.619 116.338
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 1.953125 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="16">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 125.000 127.500 130.000 130.000 133.000 136.000 139.000 142.000 145.000 145.000 145.000 135.000 135.000 135.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 0 63 60 0 0 0 0 60 63 63 72 69 69 66
</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 1.171875 -0.390625 2.734375 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="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 101.129 105.0 107.769 110.0 114.408 115.0 120.0 121.048 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 281.944 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.957 2.347 2.36 2.316 2.229 2.229 2.229 2.241 2.339 2.36 2.513 2.68 2.833 2.982 3.13 3.279 3.432 3.59 3.754 3.926 4.108 4.301 4.507 4.728 4.965 5.221 5.496 5.787 6.092 6.403 6.709 7.001 7.27 7.511 7.721 7.9 8.049 8.17 8.264 8.333 8.377 8.398 8.4 8.397 8.383 8.356 8.317 8.268 8.208 8.139 8.062 7.977 7.886 7.788 7.684 7.575 7.462 7.345 7.225 7.102 6.977 6.85 6.721 6.592 6.461 6.33 6.199 6.069 5.938 5.808 5.679 5.551 5.424 5.299 5.175 5.052 4.931 4.812 4.694 4.579 4.465 4.354 4.244 4.137 4.031 3.928 3.827 3.728 3.631 3.536 3.443 3.352 3.264 3.177 3.092 3.01 2.929 2.85 2.774 2.699 2.626 2.554 2.485 2.417 2.351 2.287 2.224 2.163 2.104 2.046 1.99 1.935 1.882 1.83 1.779 1.73 1.682 1.635 1.59 1.546 1.503 1.461 1.42 1.381 1.342 1.305 1.268 1.233 1.199 1.165 1.132 1.101 1.07 1.04 1.011 0.983 0.955 0.928 0.902 0.877 0.853 0.829 0.805 0.783 0.761 0.74 0.719 0.699 0.679 0.66 0.641 0.623 0.606 0.589 0.572 0.556 0.541 0.525 0.511 0.496 0.482 0.469 0.456 0.443 0.43 0.418 0.407 0.395 0.384 0.373 0.363 0.353 0.343 0.333 0.324 0.314 0.306 0.297 0.289 0.281 0.273 0.265 0.258 0.25 0.243 0.236 0.23

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.36" PeakHeight="101.129" Num="3" Error="4.411">
-16.177 6.45 -1.402
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.36" EndFrequency="8.4" PeakHeight="281.944" Num="5" zHalfNm="212.522" Error="2.183">
-147.664 -10.122 -8.569 5.281 0.178
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.919" Depth="0.131"/>
<TopsideChapman PeakHeight="281.944" PeakDensity="875434.25" PeakScaleHeight="54.747" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
