<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-21 -294 12:00:00.000"
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="12.0">
<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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: F2o cusp not found, Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, F2O model cusp does not fit trace</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" >
2026.10.21 (294) 12:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.39" 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">
FF202629410211200009039031101000005012000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.855" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.690" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="7.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="441.244" 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="3.110" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.228" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="298.239" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="209.102" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.972" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="111.923" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="33.287" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="60.716" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="146.190" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.240" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="48">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 358.795 362.589 366.384 370.179 373.973 377.768 381.563 385.357 389.152 392.947 396.741 400.536 404.331 408.125 411.920 415.715 419.509 423.304 423.658 424.050 424.486 424.974 425.522 426.145 426.857 427.679 428.640 429.777 431.143 432.817 434.915 437.620 441.244 445.000 455.000 465.000 493.922
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 45 54 0 0 0 0 57 0 0 0 0 42 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 42 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 -1.171875 -0.390625 -1.953125 -1.953125 1.171875 0.390625 -0.390625 -2.734375 -0.390625 -1.171875 -2.734375 -1.953125 -2.734375 -2.734375 2.734375 1.953125 1.171875 1.953125 2.734375 -1.171875 -1.953125 2.734375 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -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" >
89.527 90.0 95.0 100.0 105.0 110.0 112.73 115.0 115.461 118.191 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 298.239 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.091 2.692 3.009 3.11 2.988 2.988 2.988 3.11 3.18 3.379 3.586 3.804 4.034 4.273 4.518 4.766 5.013 5.255 5.491 5.72 5.942 6.156 6.364 6.565 6.761 6.953 7.14 7.323 7.504 7.682 7.858 8.032 8.206 8.378 8.551 8.723 8.896 9.07 9.245 9.42 9.595 9.765 9.918 10.027 10.05 10.049 10.038 10.015 9.98 9.934 9.877 9.811 9.737 9.654 9.563 9.466 9.362 9.253 9.138 9.019 8.896 8.769 8.639 8.507 8.372 8.235 8.097 7.957 7.817 7.676 7.535 7.394 7.252 7.112 6.972 6.832 6.694 6.556 6.42 6.285 6.152 6.02 5.89 5.761 5.634 5.509 5.386 5.265 5.146 5.029 4.914 4.8 4.689 4.58 4.473 4.368 4.265 4.164 4.065 3.968 3.873 3.781 3.69 3.601 3.513 3.428 3.345 3.263 3.184 3.106 3.03 2.955 2.883 2.812 2.742 2.674 2.608 2.544 2.48 2.419 2.359 2.3 2.243 2.187 2.132 2.079 2.027 1.976 1.926 1.878 1.831 1.785 1.74 1.697 1.654 1.612 1.572 1.532 1.493 1.456 1.419 1.383 1.348 1.314 1.281 1.249 1.217 1.186 1.157 1.127 1.099 1.071 1.044 1.017 0.992 0.967 0.942 0.918 0.895 0.872 0.85 0.829 0.808 0.787 0.767 0.748 0.729 0.71 0.692 0.675 0.658 0.641 0.625 0.609 0.593 0.578 0.564 0.549 0.535 0.522 0.509 0.496 0.483 0.471 0.459 0.447

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.11" PeakHeight="110.0" Num="3" Error="0.0">
-30.286 12.835 -3.022
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.11" EndFrequency="10.05" PeakHeight="298.239" Num="5" zHalfNm="209.102" Error="2.27">
-154.04 -43.666 26.266 -10.595 1.987
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.191" Depth="0.122"/>
<TopsideChapman PeakHeight="298.239" PeakDensity="1253132.8" PeakScaleHeight="60.716" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
