<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 13:30:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 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" >
2026.04.03 (093) 13:30:00</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">
FF202609304031330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="12.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.753" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="34.960" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.500" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.950" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.050" 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="24" Val="100.375" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="97.311" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.128" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.310" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.323" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="337.339" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="259.390" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.886" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="103.080" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="52.089" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.204" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="142.710" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.070" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="157">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 245.000 250.000 255.000 260.000 265.000 267.500 270.000 275.000 275.000 280.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 333.333 336.667 340.000 340.000 340.000 340.000 342.500 345.000 345.000 350.000 352.500 355.000 355.000 355.000 355.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 387.500 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 406.111 407.222 408.333 409.444 410.556 411.667 412.778 413.889 415.000 415.000 415.000 415.000 415.000 415.000 420.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 428.333 431.667 435.000 445.000 445.000 450.000 450.000 455.000 457.500 460.000 455.000 455.000 470.000 475.000 477.500 480.000 488.750 497.500 506.250 515.000 530.447
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 0 48 51 51 0 48 51 48 51 45 51 57 57 54 54 54 0 51 57 60 57 57 60 57 57 57 0 60 60 60 63 63 63 63 66 66 66 63 63 66 66 63 60 63 63 63 60 54 66 63 63 57 0 0 66 69 69 66 0 63 66 63 0 51 57 0 63 51 54 60 0 51 60 57 63 54 57 66 66 63 63 63 63 57 0 60 63 57 60 0 45 51 51 57 60 63 60 57 57 48 0 60 60 57 54 0 57 57 0 51 57 54 0 0 0 0 0 0 0 0 54 57 57 0 0 0 54 45 0 0 0 0 57 45 54 0 54 45 54 45 54 48 0 51 57 0 54 54 0 54 0 0 0 48 48
</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 -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 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 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 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.375 100.993 101.668 102.415 103.250 104.199 105.302 106.624 108.288
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 57 57 60 60 60 63 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="3">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.4 3.45 3.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 63 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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" >
90.0 95.0 97.311 99.192 100.0 101.073 102.954 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 337.339 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.175 3.36 3.236 3.236 3.236 3.36 3.427 3.581 3.729 3.873 4.015 4.157 4.298 4.441 4.584 4.73 4.879 5.03 5.184 5.341 5.502 5.667 5.837 6.011 6.189 6.372 6.561 6.755 6.954 7.159 7.369 7.586 7.808 8.037 8.271 8.512 8.759 9.011 9.27 9.534 9.804 10.078 10.357 10.639 10.923 11.208 11.489 11.764 12.024 12.262 12.464 12.612 12.691 12.7 12.697 12.679 12.644 12.593 12.528 12.448 12.356 12.252 12.138 12.013 11.88 11.738 11.589 11.433 11.272 11.106 10.935 10.761 10.583 10.403 10.22 10.036 9.851 9.665 9.479 9.293 9.107 8.922 8.737 8.554 8.372 8.192 8.013 7.837 7.662 7.49 7.32 7.152 6.987 6.824 6.664 6.507 6.353 6.201 6.052 5.906 5.762 5.622 5.484 5.349 5.217 5.087 4.961 4.837 4.716 4.597 4.481 4.368 4.258 4.15 4.044 3.941 3.84 3.742 3.646 3.552 3.461 3.372 3.285 3.2 3.117 3.036 2.957 2.881 2.806 2.733 2.661 2.592 2.524 2.458 2.394 2.332 2.271 2.211 2.153 2.097 2.042 1.988 1.936 1.885 1.836 1.787 1.74 1.695 1.65 1.606 1.564 1.523 1.483 1.444 1.406 1.369 1.333 1.297 1.263 1.23 1.197 1.166 1.135 1.105 1.076 1.047 1.02 0.993 0.966 0.941 0.916 0.892 0.868 0.845 0.823 0.801 0.78 0.759 0.739 0.72 0.701 0.682 0.664 0.646 0.629 0.613 0.597

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.36" PeakHeight="97.311" Num="3" Error="1.732">
-10.863 4.676 -1.124
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.36" EndFrequency="12.7" PeakHeight="337.339" Num="5" zHalfNm="259.39" Error="3.027">
-178.79 -67.083 10.426 0.059 1.003
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.643" Depth="0.124"/>
<TopsideChapman PeakHeight="337.339" PeakDensity="2001116.6" PeakScaleHeight="58.204" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
