<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-08 -098 05:30:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 25% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, F2O model cusp does not fit trace, 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" >
2026.04.08 (098) 05:30:00</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">
FF202609804080530009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="6.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.045" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="12.985" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="3.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="665.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="665.000" 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="84" Val="627.000" Name="QF" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="724.545" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="594.223" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="481.281" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.696" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="166.904" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.071" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="83.374" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="176.470" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.630" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="33">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
665.000 666.000 667.000 668.000 669.000 670.000 675.000 690.000 690.000 690.000 690.000 690.000 690.000 690.000 690.000 690.000 690.000 688.333 686.667 685.000 682.500 680.000 686.364 692.727 699.091 705.455 711.818 718.182 724.545 835.000 850.000 840.000 820.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
12 0 0 0 0 15 9 12 0 0 0 0 0 0 0 0 9 0 0 0 0 0 0 0 0 0 0 0 0 12 0 12 15
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 0.390625 0.390625 0.390625 0.390625 -2.734375 1.953125 2.734375 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 1.953125 1.953125 0.390625 2.734375 -1.171875 -2.734375 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 1.171875 -1.171875 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.493 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.986 185.0 190.0 195.0 200.0 205.0 210.0 215.0 219.479 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 594.223 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</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 0.316 0.292 0.26 0.216 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.23 0.251 0.272 0.293 0.314 0.335 0.354 0.358 0.395 0.43 0.465 0.501 0.538 0.576 0.616 0.658 0.702 0.748 0.797 0.849 0.904 0.961 1.022 1.086 1.152 1.222 1.294 1.369 1.447 1.527 1.609 1.693 1.779 1.867 1.956 2.047 2.139 2.232 2.326 2.421 2.517 2.614 2.711 2.809 2.908 3.008 3.108 3.209 3.311 3.413 3.516 3.619 3.723 3.827 3.932 4.037 4.143 4.249 4.356 4.463 4.57 4.677 4.784 4.891 4.998 5.105 5.21 5.315 5.419 5.521 5.621 5.718 5.812 5.902 5.987 6.065 6.137 6.2 6.254 6.296 6.327 6.345 6.35 6.35 6.347 6.34 6.329 6.314 6.295 6.272 6.246 6.217 6.185 6.15 6.112 6.072 6.029 5.984 5.936 5.887 5.836 5.784 5.729 5.674 5.617 5.558 5.499 5.439 5.378 5.316 5.253 5.19 5.126 5.062 4.998 4.933 4.869 4.804 4.739 4.674 4.609 4.544 4.479 4.415 4.35 4.286 4.223 4.16 4.097 4.034 3.972 3.911 3.85 3.789 3.729 3.67 3.611 3.553 3.496 3.439 3.383 3.327 3.272 3.218 3.164 3.111 3.059 3.007 2.956 2.906 2.856 2.808 2.759 2.712 2.665 2.619 2.573 2.529 2.485 2.441 2.398 2.356 2.315 2.274 2.234

</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="6.35" PeakHeight="594.223" Num="5" zHalfNm="481.281" Error="9.616">
-351.705 -43.461 29.244 -13.693 4.871
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="109.479" Depth="0.154"/>
<TopsideChapman PeakHeight="594.223" PeakDensity="500279.16" PeakScaleHeight="83.374" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
