<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 13:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.02.23 (054) 13:50:00</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">
FF202605402231350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="11.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.776" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="295.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="295.000" 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="10.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" 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="3.332" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.333" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="386.643" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="264.803" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.219" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="157.668" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="57.547" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="87.194" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="200.290" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="118">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 300.000 302.500 305.000 307.500 310.000 312.500 315.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 357.500 360.000 360.000 365.000 365.000 370.000 370.000 370.000 370.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 450.000 450.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 475.000 480.000 482.500 485.000 485.000 485.000 487.857 490.714 493.571 496.429 499.286 502.143 505.000 505.000 510.000 515.000 515.000 520.000 520.000 525.000 530.000 530.000 535.000 540.000 545.000 545.000 545.000 545.000 550.000 562.500 575.000 580.000 587.510 596.200 606.374 618.446 633.002 650.898 673.430
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 0 48 0 0 0 54 0 48 57 57 54 60 60 54 57 0 60 57 51 63 60 54 63 63 63 0 63 60 63 63 0 57 60 0 60 60 54 57 54 60 63 60 48 57 60 57 63 54 63 54 63 57 63 57 51 60 54 63 60 54 63 60 54 63 60 63 63 60 63 63 57 63 60 51 60 54 60 63 60 0 57 60 60 0 0 0 0 57 0 57 60 57 54 60 60 63 63 57 51 48 48 45 45 0 0 0 0 48 45 0 45 45 48 45 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 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.953125
</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" >
89.493 90.0 95.0 100.0 105.0 110.0 111.79 113.58 115.0 115.37 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 386.643 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.242 2.884 3.223 3.332 3.209 3.209 3.307 3.332 3.47 3.609 3.744 3.877 4.009 4.142 4.276 4.411 4.548 4.688 4.83 4.974 5.121 5.271 5.423 5.577 5.733 5.89 6.049 6.209 6.37 6.531 6.693 6.855 7.017 7.178 7.34 7.5 7.66 7.82 7.979 8.137 8.294 8.451 8.607 8.762 8.916 9.07 9.223 9.375 9.527 9.677 9.826 9.973 10.119 10.262 10.401 10.534 10.661 10.777 10.88 10.963 11.021 11.048 11.05 11.048 11.04 11.025 11.004 10.977 10.944 10.905 10.861 10.811 10.757 10.699 10.636 10.568 10.497 10.423 10.345 10.263 10.179 10.092 10.003 9.911 9.817 9.721 9.623 9.524 9.423 9.321 9.217 9.113 9.008 8.902 8.795 8.688 8.58 8.472 8.364 8.256 8.148 8.04 7.932 7.824 7.717 7.61 7.503 7.397 7.292 7.187 7.082 6.979 6.876 6.774 6.673 6.572 6.473 6.374 6.277 6.18 6.084 5.989 5.896 5.803 5.711 5.621 5.531 5.443 5.355 5.269 5.184 5.1 5.017 4.935 4.854 4.774 4.695 4.618 4.541 4.466 4.391 4.318 4.246 4.175 4.105 4.036 3.967 3.9 3.834 3.769 3.705 3.642 3.58 3.519 3.459 3.4 3.342 3.284 3.228 3.172 3.118 3.064 3.011 2.959 2.908 2.858 2.808 2.759 2.711 2.664 2.618 2.573 2.528 2.484 2.44 2.398 2.356 2.315 2.274 2.235 2.196 2.157 2.119 2.082 2.046 2.01

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.332" PeakHeight="110.0" Num="3" Error="0.0">
-30.459 13.09 -3.138
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.332" EndFrequency="11.05" PeakHeight="386.643" Num="5" zHalfNm="264.803" Error="3.818">
-229.816 -58.421 21.703 -7.277 2.538
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.37" Depth="0.123"/>
<TopsideChapman PeakHeight="386.643" PeakDensity="1514919.4" PeakScaleHeight="87.194" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
