<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 20:20:00.000"
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="2 2 0 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x cusp, F2 cusps do not match</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" >
2026.02.20 (051) 20:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202605102202020009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="12.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.690" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.819" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.250" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.088" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="358.017" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="285.319" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.404" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="102.171" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.124" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.993" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="123.800" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.050" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="164">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 276.250 277.500 278.750 280.000 281.250 282.500 283.750 285.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 292.000 294.000 296.000 298.000 300.000 300.000 305.000 302.500 300.000 300.000 302.500 305.000 305.000 310.000 311.667 313.333 315.000 316.667 318.333 320.000 320.000 315.000 317.500 320.000 322.500 325.000 325.000 325.000 330.000 330.000 330.000 335.000 337.500 340.000 340.000 340.000 340.000 340.000 340.000 342.500 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 361.667 363.333 365.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 371.250 372.500 373.750 375.000 375.000 380.000 380.000 380.000 380.000 380.000 382.500 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 396.000 397.000 398.000 399.000 400.000 401.000 402.000 403.000 404.000 405.000 410.000 410.000 410.000 410.000 412.500 415.000 415.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 440.000 440.000 442.500 445.000 445.000 450.000 450.000 455.000 455.000 458.750 462.500 466.250 470.000 475.000 478.892 483.297 488.324 494.115 500.858 508.809 518.324 529.916 544.347
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 45 66 78 72 66 66 54 0 69 0 0 0 0 0 63 69 0 63 66 63 60 54 48 0 0 0 0 0 0 0 0 0 0 72 72 66 0 0 0 0 0 60 63 66 0 69 0 66 72 72 66 66 72 60 0 48 0 54 63 69 72 63 66 0 0 60 66 54 57 60 66 51 57 0 0 51 0 66 69 69 66 69 72 72 72 0 0 0 69 69 69 72 69 69 69 0 69 69 69 69 69 66 66 66 69 63 63 63 57 66 0 0 0 0 0 0 0 54 0 63 51 0 54 60 0 51 0 57 0 57 54 0 42 54 60 57 54 57 57 0 42 51 42 51 57 51 54 54 54 0 0 0 57 57 57 57 0 57 54 0 51 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="29">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 120.000 120.000 117.500 115.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 118.750 117.500 116.250 115.000 115.000 115.000 115.000 115.000 118.333 121.667 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 57 63 0 54 66 69 0 72 57 63 63 66 63 69 72 72 0 54 0 63 0 60 63 54 0 0 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
</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" >
89.736 90.0 95.0 100.0 105.0 110.0 115.0 117.726 120.0 125.0 125.452 130.0 133.178 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 358.017 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.223 1.4 1.808 2.021 2.088 2.034 1.957 1.957 1.957 1.957 2.034 2.088 2.153 2.322 2.485 2.646 2.806 2.968 3.133 3.3 3.472 3.648 3.828 4.014 4.204 4.401 4.602 4.81 5.023 5.242 5.467 5.697 5.934 6.177 6.425 6.679 6.939 7.204 7.475 7.751 8.032 8.318 8.608 8.903 9.201 9.502 9.805 10.109 10.412 10.711 11.002 11.281 11.541 11.774 11.967 12.108 12.187 12.2 12.198 12.181 12.144 12.09 12.02 11.934 11.835 11.723 11.599 11.465 11.321 11.169 11.009 10.843 10.671 10.494 10.313 10.128 9.941 9.751 9.56 9.368 9.175 8.983 8.79 8.598 8.407 8.217 8.029 7.842 7.658 7.475 7.295 7.118 6.943 6.771 6.602 6.435 6.272 6.112 5.954 5.8 5.649 5.501 5.357 5.215 5.077 4.941 4.809 4.68 4.554 4.431 4.31 4.193 4.079 3.967 3.858 3.752 3.649 3.548 3.45 3.355 3.262 3.171 3.083 2.997 2.913 2.832 2.753 2.676 2.601 2.528 2.457 2.388 2.32 2.255 2.192 2.13 2.07 2.011 1.954 1.899 1.845 1.793 1.742 1.693 1.645 1.599 1.553 1.509 1.466 1.425 1.384 1.345 1.307 1.27 1.234 1.199 1.164 1.131 1.099 1.068 1.038 1.008 0.979 0.951 0.924 0.898 0.873 0.848 0.824 0.8 0.777 0.755 0.734 0.713 0.692 0.673 0.654 0.635 0.617 0.599 0.582 0.566 0.549 0.534 0.519 0.504 0.489

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.088" PeakHeight="110.0" Num="3" Error="0.0">
-29.198 11.293 -2.359
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.088" EndFrequency="12.2" PeakHeight="358.017" Num="5" zHalfNm="285.319" Error="2.258">
-188.24 -49.89 14.137 -1.762 0.916
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="23.178" Depth="0.131"/>
<TopsideChapman PeakHeight="358.017" PeakDensity="1846650.1" PeakScaleHeight="53.993" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
