<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 12:00:00.000"
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 1 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) 12:00:00</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">
FF202603101311200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="9.075" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="4.872" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.563" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.194" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="205.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" 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="7.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="2.971" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.159" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="360.828" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="173.574" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="219.240" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.710" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="181.487" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="47.341" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.476" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="103.368" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="204.680" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.910" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="84">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 267.500 270.000 271.875 273.750 275.625 277.500 279.375 281.250 283.125 285.000 290.000 290.000 290.000 290.000 292.500 295.000 295.000 300.000 301.667 303.333 305.000 307.500 310.000 312.500 315.000 320.000 325.000 325.000 330.000 330.000 335.000 335.000 340.000 345.000 345.000 350.000 355.000 355.000 360.000 360.000 365.000 370.000 370.000 375.000 375.000 380.000 385.000 385.000 390.000 395.000 405.000 410.000 410.000 415.000 420.000 425.000 435.000 440.000 445.000 455.000 460.000 470.000 475.000 485.000 490.000 500.000 510.000 515.000 525.000 535.000 540.000 550.000 560.000 565.000 575.000 586.716 600.372 616.492 635.810 659.381 688.784 726.490
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 48 0 51 0 0 51 0 0 0 0 54 0 57 57 54 0 57 0 60 0 0 57 0 57 0 60 60 54 57 54 57 57 57 57 57 60 60 54 63 57 60 60 54 57 57 57 57 60 60 63 60 60 60 63 63 63 63 63 63 63 63 60 63 60 63 60 60 63 63 60 60 57 57 57 57 54 51 51 0 0 0 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 -0.390625 -0.390625 -0.390625 -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 1.953125 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="15">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
205.000 210.000 212.500 215.000 219.545 224.091 228.636 233.182 237.727 242.273 246.818 251.364 255.909 260.455 265.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 51 0 45 0 0 0 0 0 0 0 0 51
</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 -2.734375 0.390625 -1.953125 -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="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.55 90.0 95.0 100.0 105.0 110.0 113.349 115.0 116.699 120.0 120.048 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 173.574 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 360.828 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.236 1.997 2.572 2.874 2.971 2.849 2.849 2.849 2.969 2.971 3.22 3.446 3.669 3.88 4.072 4.244 4.401 4.548 4.688 4.819 4.872 4.948 5.144 5.307 5.462 5.615 5.771 5.932 6.099 6.27 6.443 6.616 6.783 6.944 7.096 7.239 7.373 7.499 7.618 7.731 7.838 7.939 8.036 8.13 8.219 8.306 8.389 8.47 8.548 8.623 8.696 8.765 8.831 8.893 8.949 8.998 9.037 9.064 9.075 9.075 9.074 9.068 9.059 9.046 9.029 9.009 8.985 8.958 8.928 8.895 8.859 8.82 8.779 8.735 8.688 8.64 8.589 8.536 8.482 8.425 8.367 8.307 8.245 8.183 8.118 8.053 7.986 7.919 7.85 7.781 7.711 7.64 7.568 7.496 7.423 7.349 7.276 7.202 7.127 7.053 6.978 6.903 6.828 6.753 6.678 6.604 6.529 6.454 6.38 6.305 6.231 6.157 6.084 6.011 5.938 5.866 5.793 5.722 5.651 5.58 5.51 5.44 5.37 5.302 5.233 5.166 5.099 5.032 4.966 4.901 4.836 4.772 4.708 4.645 4.583 4.521 4.46 4.399 4.339 4.28 4.222 4.164 4.106 4.05 3.994 3.938 3.883 3.829 3.776 3.723 3.671 3.619 3.568 3.518 3.468 3.419 3.37 3.322 3.275 3.228 3.182 3.137 3.092 3.047 3.004 2.96 2.918 2.876 2.834 2.793 2.753 2.713 2.674 2.635 2.597 2.559 2.521 2.485 2.448 2.413 2.377 2.343 2.308 2.275 2.241 2.208 2.176 2.144

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.971" PeakHeight="110.0" Num="3" Error="0.0">
-30.171 12.666 -2.945
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="2.971" EndFrequency="4.872" PeakHeight="173.574" Num="5" Error="0.0">
-44.376 -13.852 6.389 -2.372 0.685
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="4.872" EndFrequency="9.075" PeakHeight="360.828" Num="5" zHalfNm="219.24" Error="4.278">
-178.37 -19.476 16.219 -9.527 3.9
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="10.048" Depth="0.122"/>
<TopsideChapman PeakHeight="360.828" PeakDensity="1021781.94" PeakScaleHeight="103.368" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
