<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 17:30:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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) 17:30:00</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">
FF202609204021730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="12.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.340" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.837" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" 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="11.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.151" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.248" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="421.450" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="296.228" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.569" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="168.241" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="80.001" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="91.049" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="205.000" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.370" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="169">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 12.65 12.7 12.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 230.000 233.333 236.667 240.000 245.000 245.000 250.000 255.000 260.000 265.000 265.000 265.000 270.000 270.000 275.000 275.000 277.500 280.000 280.000 280.000 285.000 285.000 287.500 290.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 315.000 315.000 320.000 320.000 322.500 325.000 325.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 342.500 345.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 435.000 435.000 435.000 440.000 440.000 442.500 445.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 470.000 470.000 470.000 470.000 475.000 480.000 480.000 480.000 482.500 485.000 485.000 485.000 487.500 490.000 492.500 495.000 495.000 495.000 497.500 500.000 501.667 503.333 505.000 506.667 508.333 510.000 512.500 515.000 517.500 520.000 522.500 525.000 525.000 530.000 531.667 533.333 535.000 535.000 537.500 540.000 542.500 545.000 545.000 555.000 560.000 565.000 570.000 570.000 571.667 573.333 579.460 586.031 593.094 600.707 608.938 617.865 627.580 638.192 649.832 662.656 676.854 692.660 710.365 730.330
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 51 0 0 45 45 45 48 54 54 48 57 51 51 54 51 57 0 57 60 57 57 60 57 63 51 0 63 54 60 63 60 66 66 63 54 63 51 60 0 57 63 57 63 54 60 51 60 63 0 63 57 60 57 63 54 63 63 63 54 60 54 60 54 60 51 60 63 60 66 60 66 66 66 66 63 66 63 51 60 63 57 63 54 63 63 63 54 63 66 60 66 60 66 57 63 57 60 63 60 63 57 60 51 54 60 60 57 48 60 54 0 63 0 60 0 57 0 57 0 54 0 57 0 54 0 0 54 0 0 54 0 0 0 45 0 45 51 42 0 0 48 51 0 51 42 45 45 51 51 0 51 42 0 0 0 0 0 0 48 0 48 0 45 45 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.52 90.0 95.0 100.0 105.0 110.0 112.555 115.0 115.11 117.665 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 421.45 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.119 2.727 3.048 3.151 3.029 3.029 3.029 3.151 3.204 3.322 3.446 3.577 3.713 3.855 4.003 4.155 4.311 4.471 4.633 4.799 4.966 5.135 5.305 5.476 5.648 5.821 5.994 6.167 6.341 6.515 6.689 6.863 7.037 7.212 7.386 7.561 7.737 7.912 8.088 8.264 8.44 8.617 8.794 8.972 9.15 9.328 9.507 9.686 9.866 10.045 10.225 10.405 10.585 10.764 10.942 11.119 11.295 11.468 11.638 11.804 11.964 12.116 12.259 12.389 12.505 12.602 12.676 12.726 12.749 12.75 12.748 12.739 12.723 12.701 12.671 12.636 12.594 12.547 12.494 12.436 12.373 12.306 12.234 12.157 12.077 11.993 11.906 11.815 11.721 11.624 11.525 11.423 11.319 11.213 11.105 10.995 10.884 10.771 10.657 10.542 10.425 10.308 10.191 10.073 9.954 9.835 9.715 9.596 9.476 9.357 9.237 9.118 8.999 8.881 8.763 8.645 8.528 8.411 8.295 8.18 8.065 7.952 7.839 7.727 7.615 7.505 7.396 7.288 7.18 7.074 6.969 6.865 6.762 6.66 6.559 6.459 6.36 6.263 6.166 6.071 5.977 5.884 5.792 5.702 5.612 5.524 5.437 5.351 5.266 5.182 5.099 5.018 4.938 4.858 4.78 4.703 4.627 4.553 4.479 4.406 4.335 4.264 4.195 4.126 4.059 3.992 3.927 3.862 3.799 3.736 3.675 3.614 3.554 3.496 3.438 3.381 3.325 3.27 3.215 3.162 3.109 3.058 3.007 2.957 2.907 2.859

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.151" PeakHeight="110.0" Num="3" Error="0.0">
-30.319 12.883 -3.044
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.151" EndFrequency="12.75" PeakHeight="421.45" Num="5" zHalfNm="296.228" Error="3.651">
-262.707 -57.257 22.473 -6.489 0.195
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.665" Depth="0.122"/>
<TopsideChapman PeakHeight="421.45" PeakDensity="2016904.5" PeakScaleHeight="91.049" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
