<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 16:30:00.000"
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 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" >
2026.04.05 (095) 16:30:00</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">
FF202609504051630009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.427" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.482" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.307" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.322" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="374.407" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="247.533" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.508" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="163.490" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.122" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="89.851" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="202.880" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="115">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 244.375 248.750 253.125 257.500 261.875 266.250 270.625 275.000 280.000 281.667 283.333 285.000 285.000 287.500 290.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 312.500 315.000 315.000 317.500 320.000 320.000 323.333 326.667 330.000 330.000 330.000 335.000 340.000 340.000 342.500 345.000 347.500 350.000 350.000 353.333 356.667 360.000 365.000 366.667 368.333 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 440.000 440.000 445.000 450.000 455.000 455.000 460.000 465.000 470.000 470.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 495.000 500.000 505.000 505.000 510.000 515.000 520.000 520.000 525.000 530.000 535.000 540.000 550.000 555.000 560.000 565.000 570.000 580.000 589.843 601.080 614.029 629.114 646.912 668.225
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 0 0 0 0 54 54 0 0 0 0 0 57 0 54 57 63 60 63 63 66 0 60 63 0 60 0 0 0 57 57 51 60 57 0 0 0 0 60 60 0 0 48 45 0 0 57 60 57 63 57 63 54 66 57 63 60 60 57 51 63 57 48 60 51 63 60 54 63 60 57 66 66 60 63 63 63 60 63 66 63 54 66 57 63 60 57 60 60 60 60 60 57 60 60 54 57 60 60 60 51 51 51 54 51 51 48 45 48 0 45 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 1.953125 -1.171875 0.390625 2.734375 -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 -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 2.734375 -0.390625 0.390625 -0.390625 1.953125
</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" >
89.496 90.0 95.0 100.0 105.0 110.0 111.893 113.785 115.0 115.678 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 374.407 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.225 2.862 3.199 3.307 3.184 3.184 3.263 3.307 3.422 3.555 3.691 3.83 3.972 4.118 4.268 4.421 4.578 4.739 4.902 5.068 5.235 5.403 5.572 5.74 5.908 6.075 6.24 6.404 6.566 6.726 6.884 7.04 7.195 7.348 7.499 7.648 7.796 7.943 8.088 8.232 8.375 8.516 8.656 8.796 8.934 9.071 9.207 9.342 9.475 9.606 9.735 9.861 9.983 10.099 10.207 10.304 10.387 10.45 10.489 10.5 10.5 10.496 10.486 10.47 10.449 10.422 10.39 10.353 10.311 10.264 10.214 10.159 10.101 10.038 9.973 9.904 9.832 9.757 9.68 9.6 9.518 9.433 9.347 9.259 9.169 9.078 8.985 8.891 8.797 8.701 8.604 8.506 8.408 8.31 8.211 8.111 8.012 7.912 7.812 7.713 7.613 7.513 7.414 7.315 7.216 7.118 7.02 6.923 6.826 6.73 6.635 6.54 6.446 6.352 6.26 6.168 6.077 5.986 5.897 5.809 5.721 5.634 5.548 5.463 5.38 5.296 5.214 5.133 5.053 4.974 4.896 4.819 4.742 4.667 4.593 4.519 4.447 4.376 4.305 4.236 4.167 4.1 4.033 3.968 3.903 3.839 3.776 3.714 3.653 3.593 3.534 3.476 3.418 3.362 3.306 3.251 3.197 3.144 3.091 3.04 2.989 2.939 2.89 2.841 2.794 2.747 2.701 2.655 2.611 2.567 2.523 2.481 2.439 2.398 2.357 2.317 2.278 2.239 2.201 2.164 2.127 2.091 2.056 2.021 1.986 1.953

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.307" PeakHeight="110.0" Num="3" Error="0.0">
-30.44 13.062 -3.126
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.307" EndFrequency="10.5" PeakHeight="374.407" Num="5" zHalfNm="247.533" Error="3.295">
-226.327 -48.128 23.0 -9.304 2.03
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.678" Depth="0.123"/>
<TopsideChapman PeakHeight="374.407" PeakDensity="1367866.0" PeakScaleHeight="89.851" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
