<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 23:30:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% 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, Trace overlaps while constructing baseline</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) 23:30:00</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">
FF202609404042330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.979" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.492" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="380.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="380.000" 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="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="412.064" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="401.041" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="386.029" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.267" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="26.536" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.405" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="11.481" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="59.660" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
385.000 385.000 382.500 380.000 382.500 385.000 392.500 400.000 405.000 420.000 427.500 435.000 440.000 445.000 452.500 460.000 455.000 455.000 457.500 460.000 462.500 465.000 464.324 463.649 462.973 462.297 461.622 460.946 460.270 459.595 458.919 458.243 457.568 456.892 456.216 455.541 454.865 454.189 453.514 452.838 452.162 451.486 450.811 450.135 449.459 448.784 448.108 447.432 446.757 446.081 445.405 444.730 444.054 443.378 442.703 442.027 441.351 440.676 440.000 435.000 435.000 435.000 430.000 425.000 422.000 419.000 416.000 413.000 410.000 407.000 404.000 401.000 398.000 395.000 400.000 402.500 405.000 405.000 408.333 411.667 415.000 420.000 410.000 400.000 395.000 410.000 408.333 406.667 405.000 415.000 405.000 409.167 413.333 417.500 421.667 425.833 405.000 407.816 412.064 419.209 433.746 479.448
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 60 0 57 0 54 57 57 60 51 57 51 0 54 54 51 0 0 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 0 0 0 48 0 0 51 0 51 0 0 54 57 60 0 0 0 0 54 60 0 57 57 0 0 60 54 0 54 48 60 0 0 57 54 54 0 0 0 0 0 54 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 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 -1.953125 0.390625 -1.171875 2.734375 -2.734375 1.171875 -1.953125 -1.171875 -1.171875 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -2.734375 2.734375 0.390625 -0.390625 1.953125 0.390625 0.390625 1.171875 0.390625 -0.390625 -0.390625 0.390625 1.171875 0.390625 1.953125 -0.390625 1.953125 0.390625 0.390625 -0.390625 -0.390625 1.171875 -0.390625 -2.734375 -0.390625 1.953125 1.171875 0.390625 -0.390625 0.390625 1.171875 -0.390625 -0.390625 -1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 2.734375 1.171875 0.390625 2.734375 -0.390625 0.390625 1.171875 0.390625 1.171875 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="97">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.194 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.387 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.581 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 401.041 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.313 0.287 0.252 0.202 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.22 0.242 0.264 0.286 0.308 0.33 0.351 0.354 0.459 0.55 0.634 0.714 0.795 0.876 0.958 1.042 1.128 1.216 1.308 1.402 1.5 1.602 1.708 1.818 1.932 2.052 2.177 2.307 2.444 2.588 2.739 2.899 3.067 3.245 3.434 3.636 3.852 4.085 4.337 4.613 4.918 5.262 5.66 6.147 6.849 7.55 7.469 7.176 6.738 6.218 5.662 5.104 4.565 4.06 3.594 3.171 2.791 2.451 2.15 1.883 1.648 1.441 1.26 1.101 0.962 0.84 0.734 0.64 0.559 0.488 0.426 0.372 0.325 0.283 0.247 0.216

</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="7.55" PeakHeight="401.041" Num="5" zHalfNm="386.029" Error="19.268">
-124.6 -95.531 37.286 -2.615 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.581" Depth="0.154"/>
<TopsideChapman PeakHeight="401.041" PeakDensity="707227.06" PeakScaleHeight="11.481" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
