<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 13:10:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.04.01 (091) 13:10:00</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">
FF202609104011310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.547" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.891" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.266" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.303" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="353.781" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="240.055" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.897" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="148.721" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.071" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.008" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="178.550" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.460" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="114">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 290.000 290.000 290.556 291.111 291.667 292.222 292.778 293.333 293.889 294.444 295.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 320.000 320.000 320.000 320.000 322.500 325.000 327.500 330.000 332.500 335.000 335.000 330.000 332.500 335.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 410.000 410.000 415.000 420.000 425.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 455.000 460.000 460.000 465.000 470.000 471.667 473.333 475.000 480.000 480.000 495.000 500.000 505.000 510.000 515.000 521.667 528.333 535.000 540.000 550.000 555.000 565.000 570.000 580.000 589.737 600.659 612.997
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 45 0 0 0 0 0 0 0 0 48 51 57 60 63 63 60 60 63 60 60 63 60 54 45 0 57 57 60 0 63 57 0 0 0 0 0 60 69 69 57 63 66 51 0 66 54 63 48 51 60 66 66 60 63 57 63 57 60 63 57 63 60 63 60 51 63 57 63 66 60 60 60 66 66 60 54 60 54 60 60 63 66 63 57 57 57 54 54 54 45 0 0 48 45 45 48 45 48 48 48 0 0 48 45 48 45 45 45 0 42 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 1.953125 -2.734375 -1.953125 -0.390625 1.953125 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 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -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 1.953125 -2.734375 -1.171875 -0.390625 -1.171875 -0.390625 2.734375 -0.390625 -1.953125 -2.734375 -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" >
89.502 90.0 95.0 100.0 105.0 110.0 112.063 114.127 115.0 116.19 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 353.781 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.197 2.827 3.16 3.266 3.144 3.144 3.196 3.266 3.411 3.578 3.734 3.885 4.036 4.188 4.343 4.503 4.667 4.837 5.013 5.195 5.382 5.574 5.771 5.97 6.171 6.373 6.575 6.776 6.974 7.17 7.364 7.554 7.741 7.925 8.105 8.283 8.458 8.63 8.8 8.967 9.132 9.294 9.454 9.612 9.768 9.92 10.07 10.215 10.356 10.49 10.616 10.728 10.824 10.897 10.94 10.95 10.95 10.944 10.93 10.909 10.881 10.846 10.804 10.757 10.703 10.644 10.58 10.511 10.437 10.36 10.278 10.192 10.103 10.011 9.915 9.817 9.717 9.614 9.51 9.403 9.295 9.185 9.075 8.963 8.85 8.736 8.622 8.507 8.392 8.277 8.161 8.046 7.931 7.816 7.701 7.586 7.473 7.359 7.247 7.135 7.023 6.913 6.803 6.694 6.587 6.48 6.374 6.269 6.166 6.063 5.962 5.862 5.763 5.665 5.568 5.473 5.378 5.285 5.194 5.103 5.014 4.926 4.839 4.754 4.67 4.587 4.505 4.424 4.345 4.267 4.19 4.115 4.04 3.967 3.895 3.824 3.754 3.686 3.618 3.552 3.487 3.423 3.36 3.298 3.237 3.177 3.118 3.061 3.004 2.948 2.893 2.839 2.786 2.734 2.683 2.633 2.584 2.536 2.488 2.442 2.396 2.351 2.307 2.263 2.221 2.179 2.138 2.098 2.058 2.019 1.981 1.944 1.907 1.871 1.836 1.801 1.767 1.733 1.701 1.668 1.637 1.606 1.575 1.545 1.516 1.487

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.266" PeakHeight="110.0" Num="3" Error="0.0">
-30.409 13.016 -3.105
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.266" EndFrequency="10.95" PeakHeight="353.781" Num="5" zHalfNm="240.055" Error="5.923">
-209.244 -41.867 18.648 -8.822 3.694
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.19" Depth="0.122"/>
<TopsideChapman PeakHeight="353.781" PeakDensity="1487624.1" PeakScaleHeight="81.008" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
