<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 01:30:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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) 01:30:00</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">
FF202609204020130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.942" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.742" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="325.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="325.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="4.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="380.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="363.740" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="306.546" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.700" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="81.807" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.567" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="44.587" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="72.960" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.490" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="51">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
385.000 385.000 325.000 325.000 330.000 325.000 327.500 330.000 332.500 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 342.500 340.000 340.000 335.000 335.455 335.909 336.364 336.818 337.273 337.727 338.182 338.636 339.091 339.545 340.000 342.500 345.000 346.667 348.333 350.000 370.000 373.333 376.667 380.000 375.000 380.000 392.491 405.974 420.571 436.427 453.713 472.630 493.421 516.378
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 57 57 57 54 0 0 0 57 60 63 63 66 60 0 69 0 60 60 51 0 0 0 0 0 63 0 60 66 0 54 63 51 0 0 51 54 0 0 51 51 57 0 0 0 0 0 0 0 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 -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 -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 2.734375 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 1.171875 1.953125 1.953125 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="167">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.279 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.559 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 221.838 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 363.74 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.334 0.317 0.295 0.265 0.224 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.222 0.243 0.264 0.284 0.305 0.326 0.346 0.354 0.382 0.447 0.559 0.709 0.864 1.015 1.168 1.325 1.492 1.672 1.871 2.092 2.344 2.632 2.958 3.315 3.676 4.01 4.3 4.542 4.742 4.905 5.036 5.141 5.222 5.282 5.323 5.345 5.35 5.35 5.34 5.318 5.286 5.243 5.191 5.132 5.064 4.99 4.911 4.826 4.738 4.645 4.55 4.453 4.353 4.252 4.151 4.049 3.946 3.844 3.742 3.641 3.54 3.441 3.343 3.247 3.152 3.059 2.967 2.878 2.79 2.704 2.62 2.538 2.458 2.38 2.305 2.231 2.159 2.089 2.021 1.955 1.891 1.829 1.769 1.71 1.654 1.599 1.545 1.494 1.444 1.395 1.348 1.303 1.259 1.217 1.176 1.136 1.097 1.06 1.024 0.989 0.956 0.923 0.892 0.861 0.832 0.803 0.776 0.749 0.724 0.699 0.675 0.652 0.63 0.608 0.587 0.567 0.548 0.529 0.511 0.493 0.476 0.46 0.444 0.429 0.414 0.4 0.386 0.373 0.36 0.348 0.336 0.324 0.313 0.302 0.292 0.282 0.272 0.263 0.254 0.245 0.237 0.228 0.221 0.213 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="5.35" PeakHeight="363.74" Num="5" zHalfNm="306.546" Error="6.226">
-153.483 20.791 -13.895 9.604 -4.919
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="111.838" Depth="0.154"/>
<TopsideChapman PeakHeight="363.74" PeakDensity="355117.88" PeakScaleHeight="44.587" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
