<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 17:50:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 75% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.02.28 (059) 17:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605902281750009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="13.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.603" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="36.176" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.250" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.410" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="14.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="95.073" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="93.317" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="3.262" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="13.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" 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="3.119" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.232" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="375.720" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="284.761" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.424" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="129.306" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="73.259" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.250" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.550" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.360" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="178">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1 13.15 13.2 13.25 13.3 13.35 13.4 13.45 13.5 13.55 13.6 13.65 13.7 13.75 13.8 13.85 13.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 285.000 290.000 292.500 295.000 295.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 310.000 310.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 327.500 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 337.500 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.714 346.429 347.143 347.857 348.571 349.286 350.000 350.000 351.667 353.333 355.000 355.000 355.000 356.667 358.333 360.000 361.667 363.333 365.000 366.667 368.333 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 376.667 378.333 380.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 396.667 398.333 400.000 403.333 406.667 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 421.667 423.333 425.000 425.000 425.000 425.000 426.667 428.333 430.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 445.000 445.000 447.500 450.000 452.500 455.000 455.000 460.000 462.500 465.000 467.500 470.000 475.000 476.667 478.333 480.000 485.000 490.000 495.000 500.000 505.000 510.842 517.368 524.705 533.014 542.503 553.442 566.189 581.236 599.265 621.261 648.694
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 57 54 0 60 63 60 69 69 57 0 0 54 60 57 57 60 51 0 60 0 63 63 63 63 57 63 0 66 66 63 0 63 57 0 48 0 48 0 45 57 0 51 51 48 0 60 63 63 60 63 60 0 60 0 0 0 0 0 0 51 48 0 0 63 57 54 0 0 0 0 0 0 0 0 66 69 72 72 69 69 72 72 0 0 66 69 54 0 0 63 48 0 0 60 0 66 48 0 57 57 0 63 0 0 63 57 0 60 48 45 0 60 0 0 48 0 51 0 57 0 57 45 0 0 0 54 57 48 0 0 45 48 54 57 0 0 57 57 54 57 51 57 48 57 60 63 42 60 0 57 54 51 0 0 0 51 51 0 0 54 48 51 51 51 51 54 54 45 48 45 42 45 0 0 0 39
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.073 96.409 97.852 99.423
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 93.317 95.0 96.008 98.699 100.0 101.39 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 375.72 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.41 2.374 2.316 2.316 2.361 2.41 2.543 2.72 2.892 3.059 3.222 3.383 3.543 3.702 3.861 4.02 4.18 4.342 4.505 4.67 4.837 5.008 5.181 5.357 5.538 5.722 5.911 6.105 6.304 6.508 6.718 6.935 7.159 7.39 7.628 7.874 8.129 8.393 8.665 8.947 9.237 9.536 9.844 10.158 10.477 10.8 11.124 11.445 11.761 12.066 12.357 12.631 12.883 13.111 13.313 13.487 13.631 13.745 13.828 13.879 13.9 13.9 13.895 13.877 13.846 13.804 13.75 13.685 13.61 13.526 13.433 13.332 13.223 13.107 12.984 12.855 12.721 12.582 12.438 12.29 12.138 11.984 11.826 11.666 11.503 11.339 11.174 11.007 10.839 10.671 10.502 10.333 10.164 9.996 9.827 9.66 9.493 9.327 9.162 8.999 8.836 8.675 8.516 8.358 8.202 8.048 7.895 7.744 7.595 7.448 7.303 7.16 7.02 6.881 6.744 6.609 6.477 6.346 6.218 6.092 5.968 5.846 5.726 5.608 5.492 5.378 5.267 5.157 5.05 4.944 4.841 4.739 4.639 4.541 4.445 4.351 4.259 4.169 4.08 3.993 3.908 3.824 3.743 3.662 3.584 3.507 3.432 3.358 3.286 3.215 3.145 3.078 3.011 2.946 2.882 2.82 2.759 2.699 2.64 2.583 2.527 2.472 2.418 2.366 2.314 2.264 2.214 2.166 2.119 2.073 2.027 1.983 1.94 1.897 1.856 1.815 1.776 1.737 1.699 1.662 1.625 1.59 1.555 1.521 1.488 1.455 1.423

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.41" PeakHeight="93.317" Num="3" Error="0.533">
-4.83 1.936 -0.423
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.41" EndFrequency="13.9" PeakHeight="375.72" Num="5" zHalfNm="284.761" Error="3.09">
-239.056 -45.99 5.255 7.181 -1.72
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.073" Depth="0.094"/>
<TopsideChapman PeakHeight="375.72" PeakDensity="2397146.5" PeakScaleHeight="70.25" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
