<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 18:40:00.000"
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" >
2026.02.22 (053) 18:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605302221840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.714" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.788" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="205.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="205.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="440.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.896" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="350.801" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="260.157" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.590" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="125.069" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="56.694" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.146" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="138.780" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.710" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="174">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
205.000 205.000 210.000 216.000 222.000 228.000 234.000 240.000 240.000 245.000 250.000 250.000 250.000 250.000 253.333 256.667 260.000 260.000 260.000 265.000 265.000 265.000 265.000 266.000 267.000 268.000 269.000 270.000 275.000 276.667 278.333 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 287.500 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 301.667 303.333 305.000 305.000 305.000 306.667 308.333 310.000 311.667 313.333 315.000 315.000 315.000 315.000 315.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 360.000 360.000 361.875 363.750 365.625 367.500 369.375 371.250 373.125 375.000 375.000 375.000 380.000 380.000 380.000 380.000 382.500 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 407.500 410.000 415.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 430.000 435.000 440.000 445.000 440.000 450.000 455.000 460.000 465.000 470.000 475.000 480.000 487.069 494.828 503.384 512.864 523.428 535.273 548.647 563.866 581.341 601.613
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 48 0 0 0 0 45 54 60 54 51 54 51 0 0 54 0 51 54 57 57 57 0 0 57 0 48 57 0 0 0 0 54 57 60 57 63 60 0 57 0 63 63 60 0 54 48 60 0 54 66 63 63 0 0 66 66 66 0 0 0 0 0 69 69 66 0 57 69 69 66 69 69 69 69 66 69 72 72 69 69 72 72 72 69 69 72 72 69 69 69 72 69 69 69 69 69 69 72 69 66 0 66 0 66 69 72 72 66 63 60 0 0 0 0 0 0 0 60 63 66 51 0 57 63 0 54 0 60 45 51 57 60 60 54 57 51 0 57 51 54 45 54 48 54 54 51 54 0 48 51 48 51 54 51 45 54 0 0 0 0 54 54 0 0 0 51 51 42 48 0 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.564 90.0 95.0 100.0 105.0 110.0 113.687 115.0 117.373 120.0 121.06 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 350.801 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.235 1.946 2.507 2.802 2.896 2.774 2.774 2.774 2.861 2.896 3.017 3.166 3.314 3.461 3.61 3.762 3.917 4.077 4.242 4.413 4.591 4.776 4.968 5.169 5.377 5.595 5.821 6.057 6.301 6.554 6.815 7.083 7.358 7.638 7.923 8.212 8.503 8.794 9.086 9.376 9.663 9.946 10.223 10.493 10.755 11.006 11.244 11.469 11.676 11.864 12.031 12.173 12.288 12.373 12.428 12.45 12.45 12.445 12.428 12.4 12.359 12.308 12.247 12.176 12.097 12.009 11.914 11.811 11.702 11.586 11.465 11.339 11.209 11.074 10.936 10.794 10.65 10.502 10.353 10.202 10.05 9.896 9.741 9.586 9.43 9.274 9.118 8.962 8.807 8.652 8.498 8.345 8.193 8.042 7.893 7.744 7.597 7.452 7.308 7.166 7.026 6.887 6.75 6.615 6.482 6.351 6.222 6.095 5.97 5.847 5.725 5.606 5.489 5.374 5.261 5.15 5.041 4.933 4.828 4.725 4.624 4.524 4.427 4.331 4.237 4.146 4.055 3.967 3.881 3.796 3.713 3.631 3.552 3.473 3.397 3.322 3.249 3.177 3.107 3.038 2.97 2.904 2.84 2.777 2.715 2.654 2.595 2.537 2.481 2.425 2.371 2.318 2.266 2.215 2.166 2.117 2.07 2.023 1.978 1.933 1.89 1.847 1.806 1.765 1.726 1.687 1.649 1.612 1.575 1.54 1.505 1.471 1.438 1.405 1.374 1.343 1.312 1.283 1.254 1.226 1.198 1.171 1.144 1.118 1.093 1.068 1.044

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.896" PeakHeight="110.0" Num="3" Error="0.0">
-30.106 12.572 -2.902
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.896" EndFrequency="12.45" PeakHeight="350.801" Num="5" zHalfNm="260.157" Error="4.149">
-200.447 -31.538 1.526 -0.584 1.302
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.06" Depth="0.122"/>
<TopsideChapman PeakHeight="350.801" PeakDensity="1923108.0" PeakScaleHeight="68.146" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
