<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 21:10:00.000"
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: 80% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.04.04 (094) 21:10:00</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">
FF202609404042110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.817" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.534" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.100" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="456.024" 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="0.908" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="360.250" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="310.903" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.542" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="72.912" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.255" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.598" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="82.630" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.250" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="187">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 280.000 285.000 286.667 288.333 290.000 285.000 284.000 283.000 282.000 281.000 280.000 280.000 280.000 280.000 280.000 280.556 281.111 281.667 282.222 282.778 283.333 283.889 284.444 285.000 290.000 290.000 291.250 292.500 293.750 295.000 295.000 295.000 295.000 295.000 296.000 297.000 298.000 299.000 300.000 301.000 302.000 303.000 304.000 305.000 305.000 300.000 301.250 302.500 303.750 305.000 305.000 306.250 307.500 308.750 310.000 311.250 312.500 313.750 315.000 320.000 317.500 315.000 315.000 317.500 320.000 325.000 325.000 325.000 325.000 325.000 327.500 330.000 325.000 326.250 327.500 328.750 330.000 331.667 333.333 335.000 337.500 340.000 340.000 340.000 340.000 340.000 340.000 341.250 342.500 343.750 345.000 345.000 347.500 350.000 350.000 350.000 352.500 355.000 355.714 356.429 357.143 357.857 358.571 359.286 360.000 360.000 365.000 365.000 365.000 367.500 370.000 370.000 370.000 370.000 372.500 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 387.500 390.000 390.000 387.500 385.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 417.500 420.000 420.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 431.667 433.333 435.000 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.973 452.206 453.820 456.024 459.213 464.240 473.333
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 66 60 0 0 54 60 0 0 0 0 66 69 63 66 57 0 66 0 69 0 0 69 0 63 72 72 0 0 0 69 0 0 69 0 0 0 0 48 48 0 0 0 0 0 0 0 0 0 0 60 66 0 0 0 69 0 0 0 0 54 0 63 66 0 69 57 0 0 48 69 0 60 66 0 69 0 69 0 0 66 0 57 0 63 69 0 72 0 66 0 72 75 63 66 48 72 60 63 0 66 0 0 0 0 72 72 63 66 69 54 60 0 66 72 0 63 0 69 75 0 63 69 0 69 60 0 66 72 54 57 66 0 72 57 60 66 0 72 57 60 66 0 69 57 66 66 66 66 0 60 63 0 63 0 63 0 57 0 0 60 0 0 60 0 51 57 0 51 54 0 0 45 42 48 0 0 48 48 0 45 48 48 45 45 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="27">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 115.000 113.750 112.500 111.250 110.000 110.000 110.588 111.176 111.765 112.353 112.941 113.529 114.118 114.706 115.294 115.882 116.471 117.059 117.647 118.235 118.824 119.412 120.000 125.000 130.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54 0 0 0 63 66 0 0 0 60 0 0 0 0 0 0 0 0 54 0 0 0 0 51 54 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 2.734375 1.171875 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -2.734375 0.390625 -0.390625 0.390625 -0.390625 -2.734375 -0.390625 2.734375 -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="162">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.382 95.0 100.0 105.0 110.0 115.0 120.0 125.0 129.605 130.0 135.0 140.0 145.0 149.209 150.0 155.0 160.0 165.0 168.814 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 360.25 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.604 0.787 0.879 0.908 0.893 0.846 0.763 0.642 0.642 0.642 0.642 0.642 0.642 0.653 0.721 0.788 0.856 0.908 0.938 1.054 1.164 1.277 1.395 1.52 1.657 1.806 1.97 2.151 2.351 2.572 2.814 3.076 3.358 3.655 3.966 4.287 4.615 4.949 5.287 5.628 5.972 6.319 6.668 7.021 7.377 7.736 8.101 8.47 8.845 9.226 9.613 10.005 10.398 10.785 11.144 11.428 11.55 11.55 11.53 11.47 11.373 11.244 11.085 10.902 10.697 10.474 10.236 9.986 9.726 9.46 9.188 8.912 8.636 8.359 8.083 7.81 7.54 7.274 7.012 6.756 6.506 6.261 6.023 5.792 5.567 5.349 5.138 4.933 4.736 4.545 4.361 4.183 4.012 3.848 3.689 3.536 3.39 3.248 3.113 2.983 2.858 2.737 2.622 2.512 2.406 2.304 2.206 2.113 2.023 1.937 1.855 1.776 1.7 1.628 1.558 1.492 1.428 1.367 1.309 1.253 1.199 1.148 1.099 1.052 1.007 0.964 0.922 0.883 0.845 0.809 0.774 0.741 0.709 0.679 0.65 0.622 0.595 0.569 0.545 0.522 0.499 0.478 0.457 0.438 0.419 0.401 0.384 0.367 0.351 0.336 0.322 0.308 0.295 0.282 0.27 0.259 0.247 0.237 0.227 0.217 0.208

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.908" PeakHeight="110.0" Num="3" Error="0.0">
-26.06 7.54 -1.098
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.908" EndFrequency="11.55" PeakHeight="360.25" Num="5" zHalfNm="310.903" Error="3.911">
-158.09 -46.285 18.906 -9.956 3.989
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="58.814" Depth="0.266"/>
<TopsideChapman PeakHeight="360.25" PeakDensity="1655117.9" PeakScaleHeight="35.598" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
