<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 10:30:00.000"
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 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x 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" >
2026.04.02 (092) 10:30:00</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">
FF202609204021030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="8.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.320" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.715" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.150" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.550" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.610" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.300" 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="24" Val="113.516" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="310.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.472" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="265.489" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="205.783" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.513" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="84.590" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="20.230" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="47.354" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="75.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.530" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="115">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 235.000 235.000 230.000 230.000 232.500 235.000 235.000 235.000 235.000 235.000 235.000 235.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 245.000 240.000 240.000 250.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 247.500 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 251.250 252.500 253.750 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 266.667 268.333 270.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 282.500 285.000 287.500 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 305.000 305.000 310.000 310.000 310.000 320.000 320.000 325.000 328.578 332.853 338.050 344.503 352.730 363.578 378.541 400.503 435.877 502.352
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 51 54 51 0 51 60 54 57 57 0 57 54 51 0 51 45 0 54 63 57 60 66 63 63 66 60 57 51 63 66 66 51 51 0 66 66 63 63 0 60 60 60 54 54 63 0 0 63 66 66 0 69 69 69 0 48 0 72 72 72 75 75 75 75 0 0 75 75 69 0 0 69 0 0 66 51 0 51 60 66 60 66 63 0 0 0 45 48 51 63 51 57 60 60 69 60 69 66 72 72 66 69 69 69 72 60 63 72 69 54 0 51 48
</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 -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 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
113.516 119.246
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="11">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
121.250 122.500 123.750 125.000 125.000 125.000 125.000 125.000 125.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 63 57 66 63 0 60 57 51
</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 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="171">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.617 90.0 95.0 100.0 105.0 110.0 115.0 115.725 120.0 121.449 125.0 127.174 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 265.489 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.753 2.26 2.525 2.61 2.51 2.478 2.478 2.478 2.56 2.61 2.687 2.822 2.958 3.096 3.241 3.393 3.557 3.733 3.927 4.142 4.385 4.663 4.985 5.36 5.789 6.255 6.721 7.154 7.534 7.859 8.132 8.358 8.543 8.691 8.803 8.883 8.932 8.95 8.95 8.942 8.916 8.873 8.815 8.742 8.656 8.558 8.449 8.332 8.205 8.072 7.933 7.788 7.638 7.485 7.329 7.171 7.011 6.851 6.689 6.528 6.367 6.207 6.048 5.89 5.734 5.58 5.429 5.279 5.132 4.988 4.846 4.707 4.571 4.437 4.307 4.18 4.055 3.934 3.816 3.7 3.588 3.478 3.372 3.268 3.167 3.069 2.974 2.881 2.791 2.704 2.619 2.537 2.457 2.379 2.304 2.231 2.16 2.091 2.025 1.96 1.898 1.837 1.778 1.722 1.666 1.613 1.561 1.511 1.463 1.416 1.37 1.326 1.283 1.242 1.202 1.163 1.126 1.089 1.054 1.02 0.987 0.955 0.924 0.894 0.865 0.837 0.81 0.784 0.759 0.734 0.71 0.687 0.665 0.644 0.623 0.603 0.583 0.564 0.546 0.528 0.511 0.494 0.478 0.463 0.448 0.433 0.419 0.406 0.393 0.38 0.368 0.356 0.344 0.333 0.322 0.312 0.302 0.292 0.282 0.273 0.264 0.256 0.247 0.239 0.232 0.224 0.217 0.21 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.61" PeakHeight="110.0" Num="3" Error="0.0">
-29.831 12.176 -2.728
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.61" EndFrequency="8.95" PeakHeight="265.489" Num="5" zHalfNm="205.783" Error="3.39">
-124.282 -3.66 -13.396 2.096 0.927
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="17.174" Depth="0.132"/>
<TopsideChapman PeakHeight="265.489" PeakDensity="993827.56" PeakScaleHeight="47.354" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
