<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 18:10:00.000"
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: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 18:10:00</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">
FF202605402231810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.516" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.549" 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="11.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="526.019" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.040" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.194" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="372.694" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="275.756" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.513" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="124.758" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.816" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.070" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="170.610" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.110" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 235.000 240.000 245.000 250.000 255.000 260.000 265.000 270.000 275.000 280.000 285.000 290.000 295.000 297.500 300.000 295.000 299.000 303.000 307.000 311.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 321.667 323.333 325.000 325.000 330.000 330.000 330.000 331.667 333.333 335.000 340.000 342.000 344.000 346.000 348.000 350.000 351.250 352.500 353.750 355.000 360.000 360.000 365.000 370.000 370.000 370.000 370.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 430.000 430.000 430.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 450.000 450.000 455.000 456.000 457.000 458.000 459.000 460.000 460.000 460.000 462.500 465.000 470.000 470.000 470.000 470.000 475.000 480.000 485.000 485.000 485.000 485.000 487.500 490.000 495.000 500.000 500.000 500.000 500.000 505.000 510.000 511.610 513.388 515.360 517.562 520.034 522.830 526.019 529.690 533.960 538.989 545.000 552.311 561.395 572.986 588.288
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 0 0 0 48 48 0 51 51 51 51 0 0 45 0 48 45 0 57 0 0 60 54 57 63 63 63 63 60 60 0 0 60 57 57 60 57 0 0 54 57 0 0 0 0 57 0 54 0 60 60 60 57 48 57 60 60 57 48 57 60 54 60 54 60 54 60 63 63 54 63 63 60 54 63 54 63 63 60 54 63 66 63 54 60 63 60 63 54 60 63 63 63 0 0 0 0 57 60 45 0 57 66 63 57 48 0 0 45 54 60 63 0 63 57 48 54 60 57 60 54 57 54 54 54 54 54 51 51 51 51 48 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 1.953125 -1.171875 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.953125 1.171875
</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" >
89.539 90.0 95.0 100.0 105.0 110.0 113.041 115.0 116.081 119.122 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 372.694 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.044 2.631 2.941 3.04 2.918 2.918 2.918 3.04 3.06 3.176 3.294 3.416 3.541 3.669 3.801 3.935 4.073 4.213 4.356 4.502 4.65 4.8 4.953 5.107 5.263 5.42 5.578 5.738 5.898 6.06 6.222 6.385 6.549 6.714 6.879 7.045 7.212 7.379 7.548 7.717 7.887 8.059 8.231 8.405 8.58 8.757 8.935 9.115 9.296 9.479 9.664 9.85 10.036 10.221 10.404 10.578 10.737 10.864 10.939 10.95 10.949 10.938 10.917 10.886 10.846 10.797 10.739 10.674 10.601 10.522 10.436 10.344 10.246 10.144 10.037 9.926 9.811 9.693 9.572 9.448 9.322 9.193 9.063 8.932 8.799 8.665 8.531 8.396 8.261 8.126 7.99 7.855 7.721 7.586 7.453 7.32 7.188 7.057 6.928 6.799 6.672 6.546 6.421 6.298 6.176 6.056 5.937 5.82 5.704 5.591 5.478 5.368 5.259 5.152 5.047 4.943 4.841 4.741 4.643 4.546 4.451 4.358 4.266 4.176 4.088 4.001 3.916 3.833 3.751 3.671 3.592 3.515 3.439 3.365 3.293 3.221 3.152 3.083 3.016 2.951 2.886 2.824 2.762 2.702 2.642 2.585 2.528 2.473 2.418 2.365 2.313 2.262 2.212 2.164 2.116 2.069 2.024 1.979 1.935 1.892 1.85 1.809 1.769 1.73 1.692 1.654 1.618 1.582 1.547 1.512 1.479 1.446 1.414 1.382 1.351 1.321 1.292 1.263 1.235 1.208 1.181 1.154 1.129 1.104 1.079 1.055

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.04" PeakHeight="110.0" Num="3" Error="0.0">
-30.228 12.751 -2.984
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.04" EndFrequency="10.95" PeakHeight="372.694" Num="5" zHalfNm="275.756" Error="3.152">
-199.008 -72.483 23.624 -6.733 1.028
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.122" Depth="0.122"/>
<TopsideChapman PeakHeight="372.694" PeakDensity="1487624.1" PeakScaleHeight="69.07" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
