<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 23:10:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2x cusp not found, 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" >
2026.04.01 (091) 23:10:00</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">
FF202609104012310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.646" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.814" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="450.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="450.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="451.013" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="415.526" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.515" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="56.939" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.791" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="26.881" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="82.010" 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="111">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
450.000 480.000 478.750 477.500 476.250 475.000 465.000 465.000 463.750 462.500 461.250 460.000 460.000 460.000 460.000 460.000 460.000 460.000 463.333 466.667 470.000 475.000 475.000 475.000 475.000 474.677 474.355 474.032 473.710 473.387 473.065 472.742 472.419 472.097 471.774 471.452 471.129 470.806 470.484 470.161 469.839 469.516 469.194 468.871 468.548 468.226 467.903 467.581 467.258 466.935 466.613 466.290 465.968 465.645 465.323 465.000 475.000 475.000 475.000 475.000 473.333 471.667 470.000 470.000 468.333 466.667 465.000 465.000 465.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 470.000 472.500 475.000 477.500 480.000 485.000 487.500 490.000 490.000 495.000 505.000 503.750 502.500 501.250 500.000 498.333 496.667 495.000 497.500 500.000 501.667 503.333 505.000 510.000 507.500 505.000 507.500 510.000 505.000 510.000 558.829
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 51 51 54 0 0 0 51 51 0 57 60 54 57 0 0 60 51 0 0 51 0 0 57 0 0 0 0 54 0 57 0 51 0 57 57 57 0 0 0 0 0 0 54 0 51 54 54 0 0 0 54 54 54 0 57 0 0 54 0 0 0 54 57 48 60 0 0 0 57 0 0 54 0 0 0 57 0 57 0 0 54 51 57 57 51 51 0 0 0 54 0 0 51 0 51 0 0 48 48 0 48 45 51 54 51 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 1.171875 -1.953125 0.390625 -1.171875 1.171875 -1.953125 -0.390625 -1.171875 -0.390625 1.171875 -0.390625 -0.390625 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.953125 0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.953125 -1.171875 -0.390625 0.390625 -1.171875 1.171875 0.390625 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -0.390625 -1.953125 -1.171875 -0.390625 -1.953125 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 -1.953125 -0.390625 1.171875 -1.171875 -0.390625 -1.953125 -0.390625 -1.953125 1.171875 0.390625 -0.390625 -0.390625 0.390625 -1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.953125 -1.171875 1.171875 -1.171875 -1.171875 1.171875 -1.171875 0.390625 -2.734375 -0.390625 -1.171875 1.953125 1.953125 0.390625 -1.953125 -0.390625 1.171875 1.953125 -0.390625 -1.171875 0.390625 -1.171875 1.171875 -0.390625 1.171875 0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="151">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.534 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.069 180.0 185.0 190.0 195.0 200.0 205.0 210.0 213.603 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 451.013 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.331 0.311 0.284 0.247 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.204 0.226 0.249 0.271 0.293 0.316 0.338 0.354 0.365 0.415 0.483 0.571 0.674 0.782 0.891 0.999 1.105 1.212 1.318 1.425 1.533 1.641 1.752 1.864 1.979 2.096 2.215 2.338 2.464 2.594 2.727 2.865 3.007 3.154 3.306 3.464 3.627 3.798 3.975 4.16 4.354 4.557 4.77 4.994 5.23 5.48 5.746 6.028 6.331 6.656 7.007 7.388 7.802 8.247 8.694 8.989 9.0 8.981 8.909 8.788 8.627 8.433 8.21 7.966 7.706 7.434 7.154 6.87 6.584 6.299 6.018 5.741 5.47 5.207 4.951 4.704 4.466 4.237 4.017 3.807 3.606 3.414 3.231 3.057 2.891 2.734 2.585 2.443 2.308 2.181 2.06 1.946 1.838 1.736 1.639 1.547 1.461 1.379 1.302 1.229 1.16 1.095 1.033 0.975 0.92 0.869 0.82 0.774 0.73 0.689 0.65 0.613 0.579 0.546 0.515 0.486 0.459 0.433 0.409 0.385 0.364 0.343 0.324 0.306 0.288 0.272 0.257 0.242 0.228 0.216 0.203

</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="9.0" PeakHeight="451.013" Num="5" zHalfNm="415.526" Error="6.288">
-186.0 -85.976 43.935 -6.619 -2.75
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="103.603" Depth="0.154"/>
<TopsideChapman PeakHeight="451.013" PeakDensity="1004962.75" PeakScaleHeight="26.881" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
