<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 21:50:00.000"
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 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" >
2026.02.26 (057) 21:50:00</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">
FF202605702262150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.455" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.432" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.476" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="432.888" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="358.922" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.974" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="108.511" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="29.057" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.329" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.910" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.810" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="144">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.8 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.714 346.429 347.143 347.857 348.571 349.286 350.000 355.000 356.000 357.000 358.000 359.000 360.000 355.000 355.000 357.500 360.000 360.000 361.667 363.333 365.000 366.000 367.000 368.000 369.000 370.000 370.000 370.000 370.000 372.500 375.000 375.000 375.000 375.000 375.000 377.500 380.000 381.250 382.500 383.750 385.000 386.000 387.000 388.000 389.000 390.000 385.000 390.000 391.429 392.857 394.286 395.714 397.143 398.571 400.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 410.000 410.000 410.000 410.000 410.000 415.000 416.000 417.000 418.000 419.000 420.000 420.000 422.143 424.286 426.429 428.571 430.714 432.857 435.000 435.000 440.000 440.000 440.000 440.000 445.000 447.500 450.000 450.000 455.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 465.000 470.000 475.000 475.000 475.000 480.000 485.000 490.000 490.000 490.000 490.000 495.000 505.000 500.000 505.000 510.000 515.000 520.000 520.000 525.000 530.000 534.186 538.767 543.801 549.359 555.528 562.414 570.149 578.903 588.888 600.385 613.767
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 0 54 51 0 0 0 57 60 0 66 0 60 0 57 0 0 0 0 63 60 0 0 0 0 48 54 51 0 66 63 0 0 60 0 0 0 0 66 0 75 78 0 69 69 0 0 72 0 66 0 0 0 60 0 0 0 0 57 0 63 0 0 0 0 0 0 60 0 0 72 0 0 0 69 60 63 48 0 60 48 0 48 0 0 54 54 0 60 0 0 0 0 54 60 51 57 63 66 66 0 66 69 57 63 66 57 63 60 60 57 54 60 60 0 57 0 0 45 60 63 57 60 45 57 0 57 60 60 63 63 63 0 63 60 60 0 60 0 0 48 45 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 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.836 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 138.258 140.0 145.0 150.0 155.0 160.0 165.0 166.515 170.0 175.0 180.0 185.0 190.0 194.773 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 432.888 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.315 0.412 0.461 0.476 0.47 0.451 0.417 0.365 0.283 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.234 0.283 0.332 0.381 0.429 0.476 0.48 0.567 0.65 0.735 0.824 0.918 1.019 1.127 1.244 1.37 1.505 1.651 1.808 1.975 2.154 2.343 2.543 2.754 2.975 3.206 3.446 3.694 3.95 4.214 4.485 4.761 5.043 5.329 5.62 5.913 6.209 6.506 6.803 7.099 7.393 7.682 7.966 8.241 8.506 8.758 8.995 9.212 9.408 9.578 9.719 9.828 9.904 9.944 9.95 9.949 9.934 9.906 9.863 9.808 9.741 9.663 9.575 9.478 9.373 9.26 9.14 9.015 8.884 8.748 8.609 8.466 8.32 8.172 8.022 7.87 7.718 7.564 7.411 7.257 7.104 6.952 6.8 6.649 6.5 6.352 6.205 6.061 5.918 5.777 5.638 5.502 5.367 5.235 5.106 4.978 4.853 4.73 4.61 4.492 4.377 4.264 4.154 4.046 3.94 3.837 3.736 3.637 3.541 3.447 3.355 3.266 3.179 3.093 3.01 2.929 2.85 2.773 2.698 2.625 2.554 2.484 2.417 2.351 2.287 2.224 2.164 2.104 2.047 1.991 1.936 1.883 1.831 1.781 1.732 1.684 1.637 1.592 1.548 1.506 1.464 1.424 1.384 1.346 1.309 1.273 1.237 1.203 1.17 1.137 1.106 1.075 1.045 1.016 0.988 0.961 0.934 0.908 0.883 0.858 0.835 0.811 0.789 0.767 0.746 0.725 0.705 0.685 0.666

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.476" PeakHeight="110.0" Num="3" Error="0.0">
-21.888 4.08 -0.356
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.476" EndFrequency="9.95" PeakHeight="432.888" Num="5" zHalfNm="358.922" Error="3.631">
-229.926 -15.547 8.266 -2.542 1.634
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="84.773" Depth="0.276"/>
<TopsideChapman PeakHeight="432.888" PeakDensity="1228318.9" PeakScaleHeight="55.329" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
