<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 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" >
2026.04.03 (093) 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">
FF202609304031730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.428" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.614" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="205.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="205.000" 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="0.500" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" 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="3.149" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.247" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="372.779" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="250.752" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.570" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="157.017" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="51.418" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="85.711" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="198.920" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.310" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="128">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.2 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
205.000 205.000 207.500 210.000 215.000 215.000 220.000 226.667 233.333 240.000 245.000 250.000 255.000 256.250 257.500 258.750 260.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 272.500 275.000 275.000 280.000 285.000 290.000 290.000 295.000 295.000 295.000 300.000 305.000 306.667 308.333 310.000 310.000 315.000 320.000 325.000 330.000 330.000 335.000 335.000 340.000 345.000 345.000 350.000 350.000 355.000 360.000 360.000 365.000 365.000 367.500 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 480.000 485.000 485.000 495.000 495.000 500.000 505.000 510.000 510.000 515.000 520.000 520.000 520.000 525.000 530.000 535.000 540.000 543.810 548.038 552.759 558.064 564.068 570.919 578.810 587.996 598.827 611.787 627.571 647.215
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 48 48 48 48 0 0 45 45 48 45 0 48 0 51 54 54 0 54 57 57 54 0 57 51 57 57 48 57 48 57 57 57 54 0 0 60 0 0 60 57 51 60 57 60 0 51 60 54 63 57 48 57 48 60 0 57 48 60 66 60 63 57 63 57 63 54 60 63 0 63 60 63 60 54 60 66 63 54 63 57 63 60 63 63 63 63 63 63 63 60 63 63 60 60 63 60 60 63 60 54 60 57 54 48 57 54 48 57 54 51 54 54 54 54 54 51 51 51 48 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 -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 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 0.390625 0.390625 -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" >
89.521 90.0 95.0 100.0 105.0 110.0 112.564 115.0 115.128 117.692 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 372.779 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.117 2.725 3.047 3.149 3.027 3.027 3.027 3.149 3.206 3.336 3.475 3.624 3.781 3.946 4.118 4.294 4.473 4.654 4.835 5.015 5.193 5.369 5.542 5.713 5.881 6.046 6.209 6.369 6.527 6.683 6.837 6.989 7.14 7.29 7.438 7.585 7.731 7.876 8.021 8.165 8.308 8.451 8.594 8.736 8.878 9.02 9.162 9.303 9.444 9.583 9.722 9.858 9.991 10.119 10.239 10.347 10.439 10.507 10.544 10.55 10.549 10.543 10.53 10.51 10.485 10.453 10.416 10.374 10.326 10.274 10.217 10.156 10.091 10.022 9.949 9.874 9.795 9.713 9.628 9.541 9.451 9.36 9.266 9.171 9.074 8.976 8.876 8.776 8.674 8.572 8.468 8.365 8.26 8.156 8.051 7.946 7.841 7.736 7.631 7.526 7.422 7.317 7.214 7.11 7.008 6.905 6.804 6.703 6.603 6.503 6.405 6.307 6.21 6.114 6.019 5.925 5.832 5.739 5.648 5.558 5.469 5.381 5.293 5.207 5.122 5.038 4.956 4.874 4.793 4.713 4.635 4.557 4.481 4.406 4.331 4.258 4.186 4.115 4.045 3.976 3.908 3.841 3.775 3.71 3.646 3.583 3.521 3.46 3.4 3.341 3.283 3.226 3.17 3.115 3.06 3.007 2.954 2.902 2.851 2.801 2.752 2.703 2.656 2.609 2.563 2.517 2.473 2.429 2.386 2.344 2.302 2.261 2.221 2.182 2.143 2.105 2.067 2.03 1.994 1.959 1.924 1.889 1.856 1.822 1.79 1.758

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.149" PeakHeight="110.0" Num="3" Error="0.0">
-30.317 12.881 -3.043
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.149" EndFrequency="10.55" PeakHeight="372.779" Num="5" zHalfNm="250.752" Error="3.651">
-222.347 -51.581 27.876 -9.98 0.945
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.692" Depth="0.122"/>
<TopsideChapman PeakHeight="372.779" PeakDensity="1380924.4" PeakScaleHeight="85.711" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
