<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 17:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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) 17:50:00</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">
FF202609204021750009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="12.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.328" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.327" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.900" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" 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="3.076" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.211" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="420.187" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="300.137" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.754" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="160.887" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="75.135" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="87.060" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="200.830" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.290" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="168">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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" >
230.000 230.000 235.000 237.500 240.000 241.667 243.333 245.000 248.750 252.500 256.250 260.000 265.000 267.500 270.000 270.000 270.000 275.000 275.000 275.000 278.333 281.667 285.000 290.000 290.000 295.000 300.000 300.000 305.000 305.000 310.000 310.000 315.000 315.000 317.500 320.000 322.500 325.000 330.000 330.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 350.000 352.500 355.000 357.500 360.000 362.500 365.000 365.000 367.500 370.000 370.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 392.500 395.000 395.000 397.500 400.000 400.000 400.000 400.000 402.500 405.000 410.000 415.000 415.000 415.000 417.500 420.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 450.000 452.500 455.000 457.500 460.000 465.000 465.000 465.000 470.000 472.500 475.000 475.000 476.250 477.500 478.750 480.000 480.000 480.000 480.000 482.500 485.000 490.000 492.500 495.000 490.000 492.500 495.000 495.000 496.667 498.333 500.000 505.000 510.000 510.000 510.000 515.000 515.000 516.250 517.500 518.750 520.000 525.000 528.333 531.667 535.000 538.333 541.667 545.000 540.000 542.500 545.000 555.000 560.000 560.000 565.000 565.000 570.000 575.000 580.000 585.000 590.000 595.000 600.000 606.662 613.930 621.891 630.649 640.330 651.088 663.113 676.643 691.981 709.513
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 54 0 48 0 0 51 0 51 0 51 48 0 48 54 57 57 60 54 51 0 57 57 57 57 54 60 57 63 60 63 60 63 0 63 0 63 60 63 63 63 63 66 60 66 66 66 54 60 0 0 0 54 63 51 60 66 57 63 54 60 66 60 63 54 0 51 60 0 57 63 54 63 48 66 45 57 63 69 60 69 57 63 66 63 63 60 66 63 66 60 66 57 63 69 60 69 57 66 54 63 69 57 0 51 57 0 0 0 63 66 60 51 0 60 60 0 57 57 0 57 57 0 0 45 54 48 54 54 51 54 0 0 0 0 51 0 42 0 0 0 45 51 45 0 48 45 51 51 48 0 51 51 0 0 51 51 48 48 0 0 45 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 2.734375 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 -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 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 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 1.953125 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 1.953125 -1.953125 0.390625 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 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
</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" >
89.533 90.0 95.0 100.0 105.0 110.0 112.881 115.0 115.762 118.643 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 420.187 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.237 2.068 2.662 2.976 3.076 2.954 2.954 2.954 3.076 3.106 3.221 3.342 3.47 3.604 3.743 3.888 4.037 4.191 4.347 4.507 4.668 4.832 4.996 5.162 5.329 5.496 5.663 5.831 5.999 6.167 6.336 6.505 6.673 6.843 7.012 7.182 7.352 7.522 7.693 7.864 8.036 8.208 8.381 8.555 8.73 8.905 9.081 9.257 9.435 9.613 9.792 9.972 10.153 10.333 10.515 10.696 10.877 11.058 11.237 11.414 11.588 11.758 11.921 12.075 12.217 12.344 12.45 12.53 12.582 12.6 12.6 12.596 12.585 12.566 12.539 12.506 12.466 12.42 12.368 12.31 12.246 12.178 12.104 12.026 11.944 11.857 11.767 11.673 11.576 11.476 11.373 11.267 11.159 11.048 10.936 10.822 10.706 10.589 10.471 10.351 10.231 10.109 9.987 9.865 9.742 9.618 9.495 9.371 9.248 9.124 9.001 8.878 8.756 8.634 8.512 8.391 8.271 8.151 8.033 7.915 7.797 7.681 7.566 7.452 7.339 7.226 7.115 7.005 6.896 6.789 6.682 6.577 6.472 6.369 6.268 6.167 6.068 5.97 5.873 5.777 5.683 5.59 5.498 5.407 5.318 5.23 5.143 5.057 4.973 4.89 4.808 4.727 4.647 4.569 4.492 4.416 4.341 4.267 4.194 4.123 4.052 3.983 3.915 3.848 3.782 3.717 3.653 3.59 3.528 3.467 3.407 3.348 3.29 3.233 3.177 3.122 3.067 3.014 2.961 2.91 2.859 2.809 2.76 2.712 2.664 2.618 2.572

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.076" PeakHeight="110.0" Num="3" Error="0.0">
-30.258 12.795 -3.004
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.076" EndFrequency="12.6" PeakHeight="420.187" Num="5" zHalfNm="300.137" Error="3.836">
-255.968 -63.75 24.745 -6.62 0.049
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.643" Depth="0.122"/>
<TopsideChapman PeakHeight="420.187" PeakDensity="1969727.0" PeakScaleHeight="87.06" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
