<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 20:00:00.000"
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 F2x 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) 20:00:00</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">
FF202603101312000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.417" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.169" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" Name="h`Es" 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="9.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.303" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="390.774" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="277.887" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.016" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="152.080" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.205" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.093" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="174.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.490" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.100" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
235.000 235.000 235.000 240.000 240.000 240.000 242.000 244.000 246.000 248.000 250.000 252.000 254.000 256.000 258.000 260.000 265.000 265.000 267.500 270.000 271.667 273.333 275.000 276.667 278.333 280.000 280.000 284.000 288.000 292.000 296.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 307.500 310.000 312.500 315.000 317.500 320.000 320.000 322.000 324.000 326.000 328.000 330.000 331.667 333.333 335.000 337.500 340.000 342.143 344.286 346.429 348.571 350.714 352.857 355.000 358.333 361.667 365.000 365.000 365.000 365.000 365.000 367.500 370.000 372.500 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 455.000 460.000 460.000 465.000 465.000 470.000 475.000 480.000 485.000 490.000 490.000 495.000 495.000 500.000 505.000 505.000 505.000 510.000 515.000 520.000 520.000 530.000 530.000 535.000 540.000 545.000 550.000 560.000 565.000 573.571 582.143 590.714 599.286 607.857 616.429 630.083 645.714
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 63 63 60 66 60 0 0 57 0 0 0 0 54 0 60 60 60 0 60 0 51 0 0 0 69 66 0 0 60 0 60 63 66 63 69 60 51 0 0 0 0 0 57 0 0 54 0 0 60 0 0 63 0 60 0 54 0 66 0 0 63 0 0 48 57 63 66 66 45 66 0 66 69 63 69 57 63 54 0 63 57 66 66 66 57 66 60 66 63 69 66 69 66 63 63 60 66 66 63 63 66 63 60 66 63 60 63 63 60 60 54 66 63 66 66 60 66 66 63 66 66 66 63 63 63 66 63 63 57 60 0 0 0 0 0 48 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 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 1.953125 1.953125 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="33">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 110.000 110.000 110.000 115.000 120.000 125.000 120.000 117.500 115.000 115.000 115.000 112.500 110.000 110.000 115.000 115.000 115.000 115.000 115.000 117.500 120.000 115.000 115.714 116.429 117.143 117.857 118.571 119.286 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 60 0 66 0 0 48 57 0 60 0 57 54 0 0 0 60 66 0 63 0 54 0 0 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 0.390625 1.953125 -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 -1.953125 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 2.734375 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" >
89.683 90.0 95.0 100.0 105.0 110.0 115.0 116.588 120.0 123.176 125.0 129.764 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 390.774 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.227 1.545 1.994 2.229 2.303 2.23 2.176 2.176 2.176 2.211 2.303 2.309 2.429 2.545 2.661 2.78 2.901 3.027 3.158 3.295 3.439 3.59 3.748 3.914 4.086 4.265 4.448 4.635 4.824 5.014 5.204 5.392 5.579 5.763 5.945 6.124 6.3 6.473 6.643 6.811 6.977 7.14 7.301 7.46 7.617 7.773 7.927 8.08 8.231 8.381 8.53 8.677 8.823 8.967 9.109 9.248 9.383 9.513 9.636 9.749 9.847 9.925 9.978 10.0 10.0 9.997 9.987 9.97 9.947 9.916 9.88 9.838 9.79 9.737 9.679 9.617 9.55 9.479 9.404 9.326 9.244 9.16 9.072 8.982 8.89 8.795 8.699 8.601 8.501 8.4 8.298 8.194 8.09 7.985 7.88 7.774 7.668 7.561 7.455 7.348 7.241 7.135 7.029 6.924 6.818 6.714 6.61 6.506 6.404 6.302 6.2 6.1 6.001 5.902 5.805 5.708 5.613 5.518 5.425 5.332 5.241 5.151 5.062 4.974 4.888 4.802 4.718 4.634 4.552 4.471 4.392 4.313 4.236 4.16 4.085 4.011 3.938 3.866 3.796 3.727 3.658 3.591 3.525 3.46 3.396 3.334 3.272 3.211 3.152 3.093 3.035 2.979 2.923 2.868 2.815 2.762 2.71 2.659 2.609 2.56 2.512 2.464 2.418 2.372 2.327 2.283 2.24 2.197 2.155 2.115 2.074 2.035 1.996 1.958 1.921 1.884 1.848 1.813 1.778 1.744 1.711 1.678 1.646 1.615 1.584 1.554 1.524

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.303" PeakHeight="110.0" Num="3" Error="0.0">
-29.484 11.687 -2.52
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.303" EndFrequency="10.0" PeakHeight="390.774" Num="5" zHalfNm="277.887" Error="5.978">
-230.811 -44.273 22.663 -12.547 3.958
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.764" Depth="0.127"/>
<TopsideChapman PeakHeight="390.774" PeakDensity="1240694.8" PeakScaleHeight="80.093" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
