<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 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: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.03.31 (090) 18:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003311810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.571" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.992" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.300" 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="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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="511.243" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.994" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.171" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="360.403" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="262.210" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.438" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="125.968" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.287" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.700" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="171.430" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.130" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 280.000 285.000 290.000 290.000 295.000 295.000 300.000 302.500 305.000 307.500 310.000 312.500 315.000 318.125 321.250 324.375 327.500 330.625 333.750 336.875 340.000 340.000 340.000 341.250 342.500 343.750 345.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 362.857 365.714 368.571 371.429 374.286 377.143 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 475.000 475.000 480.000 480.000 480.000 480.000 485.000 485.000 487.500 490.000 495.000 495.000 496.014 497.145 498.415 499.852 501.490 503.376 505.570 508.155 511.243 515.000 519.668 525.624 533.487 544.347 560.322 586.138
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 45 0 0 51 54 54 48 48 0 51 0 48 0 51 0 48 0 0 0 0 0 54 57 60 0 0 0 54 60 60 57 60 63 0 54 66 63 57 0 0 45 0 0 0 48 54 57 48 54 60 51 57 0 54 60 54 60 54 63 54 60 63 60 63 63 54 60 54 60 54 48 60 54 60 60 63 60 54 63 60 63 60 63 60 63 54 60 60 54 63 57 0 57 57 57 48 0 0 0 54 0 54 54 48 45 51 51 48 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 -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 2.734375 0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -1.171875 1.171875 -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" >
89.547 90.0 95.0 100.0 105.0 110.0 113.245 115.0 116.491 119.736 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 360.403 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.013 2.591 2.897 2.994 2.872 2.872 2.872 2.994 3.003 3.164 3.316 3.463 3.608 3.752 3.896 4.041 4.187 4.334 4.483 4.633 4.785 4.938 5.093 5.249 5.407 5.565 5.724 5.885 6.046 6.207 6.369 6.532 6.695 6.858 7.022 7.187 7.352 7.517 7.683 7.849 8.016 8.184 8.353 8.522 8.693 8.864 9.037 9.21 9.385 9.559 9.733 9.905 10.072 10.227 10.362 10.46 10.5 10.5 10.496 10.481 10.457 10.424 10.382 10.332 10.274 10.209 10.137 10.059 9.976 9.886 9.792 9.694 9.591 9.484 9.374 9.261 9.145 9.026 8.906 8.783 8.659 8.534 8.408 8.281 8.153 8.024 7.896 7.767 7.639 7.51 7.383 7.255 7.128 7.002 6.877 6.753 6.63 6.508 6.387 6.267 6.149 6.032 5.916 5.802 5.689 5.578 5.468 5.36 5.254 5.149 5.045 4.943 4.843 4.745 4.648 4.553 4.459 4.367 4.277 4.188 4.1 4.015 3.931 3.848 3.767 3.688 3.61 3.533 3.458 3.385 3.312 3.242 3.172 3.104 3.038 2.973 2.909 2.846 2.785 2.724 2.665 2.608 2.551 2.496 2.442 2.389 2.337 2.286 2.236 2.187 2.14 2.093 2.047 2.002 1.959 1.916 1.874 1.833 1.792 1.753 1.715 1.677 1.64 1.604 1.569 1.534 1.501 1.468 1.435 1.404 1.373 1.343 1.313 1.284 1.256 1.228 1.201 1.174 1.148 1.123 1.098 1.074 1.05 1.027 1.004 0.982

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.994" PeakHeight="110.0" Num="3" Error="0.0">
-30.19 12.695 -2.958
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.994" EndFrequency="10.5" PeakHeight="360.403" Num="5" zHalfNm="262.21" Error="2.074">
-194.945 -65.969 24.715 -6.214 1.746
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.736" Depth="0.122"/>
<TopsideChapman PeakHeight="360.403" PeakDensity="1367866.0" PeakScaleHeight="69.7" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
