<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 16:10:00.000"
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" >
2026.04.02 (092) 16:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609204021610009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="12.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.542" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.033" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" 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="3.347" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.340" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="376.321" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="278.930" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.149" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="129.846" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="62.846" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.401" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="167.690" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 245.000 245.000 250.000 250.000 255.000 260.000 260.000 264.000 268.000 272.000 276.000 280.000 282.500 285.000 290.000 290.000 292.500 295.000 300.000 300.000 300.000 300.000 300.000 302.500 305.000 307.500 310.000 311.250 312.500 313.750 315.000 315.000 317.500 320.000 322.500 325.000 327.500 330.000 332.500 335.000 337.500 340.000 342.500 345.000 350.000 350.000 350.000 350.000 352.000 354.000 356.000 358.000 360.000 362.000 364.000 366.000 368.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 375.000 385.000 385.000 380.000 383.333 386.667 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 405.000 407.000 409.000 411.000 413.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 422.500 420.000 420.000 420.000 422.500 425.000 430.000 430.000 430.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 440.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 447.500 450.000 455.000 457.500 460.000 462.500 465.000 465.000 465.000 465.000 465.000 475.000 475.000 470.000 480.000 485.000 485.000 490.000 495.000 495.000 495.000 500.000 503.800 507.902 512.344 517.169 522.429 528.187 534.515 541.504 549.263 557.925 567.659 578.676 591.250 605.733 622.597
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 45 51 51 54 0 45 54 0 45 0 0 51 0 51 51 51 0 54 0 0 54 54 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 0 57 45 54 60 63 0 0 0 0 48 0 0 0 0 66 69 63 66 66 0 0 54 60 63 63 0 0 69 69 66 63 63 63 60 57 63 66 63 66 66 63 0 0 0 0 60 66 66 51 0 60 63 48 0 63 60 48 0 63 57 0 0 63 60 57 0 0 0 54 57 60 60 60 57 57 0 0 54 0 57 51 0 0 0 42 48 0 51 0 45 51 51 51 48 54 51 48 54 54 51 54 54 54 54 54 54 54 51 51 42 0 0 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 -1.953125 -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 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.953125 -2.734375 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.171875 0.390625 -2.734375
</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" >
89.49 90.0 95.0 100.0 105.0 110.0 111.729 113.457 115.0 115.186 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 376.321 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.252 2.897 3.238 3.347 3.224 3.224 3.334 3.347 3.48 3.618 3.756 3.895 4.034 4.175 4.318 4.462 4.608 4.756 4.906 5.059 5.214 5.372 5.533 5.696 5.863 6.032 6.204 6.379 6.558 6.739 6.924 7.113 7.304 7.499 7.697 7.899 8.104 8.312 8.524 8.739 8.956 9.177 9.401 9.628 9.856 10.087 10.318 10.551 10.783 11.013 11.24 11.463 11.677 11.881 12.069 12.237 12.38 12.491 12.565 12.598 12.6 12.597 12.583 12.558 12.523 12.478 12.423 12.36 12.289 12.21 12.123 12.03 11.931 11.826 11.715 11.6 11.48 11.356 11.228 11.097 10.962 10.825 10.686 10.545 10.402 10.257 10.111 9.964 9.817 9.669 9.52 9.372 9.223 9.075 8.927 8.779 8.633 8.487 8.341 8.197 8.054 7.912 7.771 7.632 7.494 7.358 7.223 7.089 6.957 6.827 6.699 6.572 6.447 6.323 6.202 6.082 5.964 5.848 5.733 5.621 5.51 5.401 5.294 5.188 5.085 4.983 4.883 4.785 4.688 4.593 4.5 4.408 4.319 4.23 4.144 4.059 3.976 3.894 3.814 3.735 3.658 3.582 3.508 3.435 3.364 3.294 3.225 3.158 3.092 3.028 2.964 2.902 2.842 2.782 2.724 2.667 2.611 2.556 2.502 2.449 2.398 2.347 2.298 2.249 2.202 2.155 2.11 2.065 2.022 1.979 1.937 1.896 1.856 1.816 1.778 1.74 1.703 1.667 1.632 1.597 1.563 1.53 1.498 1.466 1.435 1.404

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.347" PeakHeight="110.0" Num="3" Error="0.0">
-30.47 13.106 -3.146
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.347" EndFrequency="12.6" PeakHeight="376.321" Num="5" zHalfNm="278.93" Error="3.053">
-212.005 -60.605 11.91 -0.765 0.33
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.186" Depth="0.123"/>
<TopsideChapman PeakHeight="376.321" PeakDensity="1969727.0" PeakScaleHeight="72.401" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
