<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-06 -096 00:50:00.000"
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" >
2026.04.06 (096) 00:50:00</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">
FF202609604060050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.697" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.260" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="447.500" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="447.500" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="481.367" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="433.125" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="399.211" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.798" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="54.695" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.122" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="24.808" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="81.320" 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="57">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
505.000 495.000 490.000 500.000 500.000 498.750 497.500 496.250 495.000 493.333 491.667 490.000 495.000 494.000 493.000 492.000 491.000 490.000 489.000 488.000 487.000 486.000 485.000 484.000 483.000 482.000 481.000 480.000 480.000 480.000 480.000 480.000 475.000 475.000 465.000 465.000 465.000 463.333 461.667 460.000 458.333 456.667 455.000 453.333 451.667 450.000 448.750 447.500 465.000 465.000 470.000 472.960 476.647 481.367 487.625 496.320 509.219
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 51 51 54 48 0 0 0 54 0 0 57 54 0 0 51 54 0 0 0 0 0 0 0 0 0 0 48 0 0 0 57 51 48 48 0 51 0 51 0 0 51 48 51 0 54 0 0 57 54 48 48 0 48 48 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 -1.171875 1.953125 -0.390625 -1.171875 -1.171875 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -1.953125 1.953125 0.390625 1.171875 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 -0.390625 -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 1.171875 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="136">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.831 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.663 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 220.494 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 433.125 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0
</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 0.333 0.317 0.293 0.262 0.22 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.206 0.226 0.247 0.268 0.289 0.31 0.331 0.352 0.354 0.383 0.425 0.481 0.558 0.657 0.77 0.887 1.001 1.112 1.221 1.328 1.433 1.538 1.642 1.747 1.852 1.958 2.065 2.174 2.285 2.397 2.512 2.629 2.75 2.873 2.999 3.129 3.264 3.403 3.546 3.696 3.852 4.014 4.185 4.365 4.556 4.761 4.981 5.222 5.49 5.8 6.179 6.4 6.396 6.355 6.271 6.153 6.005 5.834 5.645 5.443 5.232 5.014 4.795 4.575 4.357 4.142 3.932 3.728 3.53 3.34 3.157 2.982 2.814 2.654 2.502 2.358 2.221 2.091 1.968 1.852 1.742 1.639 1.541 1.449 1.362 1.28 1.203 1.13 1.062 0.998 0.937 0.881 0.827 0.777 0.73 0.685 0.644 0.605 0.568 0.533 0.501 0.47 0.442 0.415 0.389 0.366 0.343 0.322 0.303 0.284 0.267 0.251 0.235 0.221 0.208

</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="6.4" PeakHeight="433.125" Num="5" zHalfNm="399.211" Error="8.712">
-162.555 -82.857 47.843 -13.786 -1.276
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="110.494" Depth="0.154"/>
<TopsideChapman PeakHeight="433.125" PeakDensity="508188.6" PeakScaleHeight="24.808" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
