<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 18:30:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, 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) 18:30:00</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">
FF202605902281830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="13.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.719" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="35.623" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="467.428" 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="2.946" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.147" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="348.471" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="276.938" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.573" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="96.391" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.369" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="52.472" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="130.290" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.050" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="179">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 232.500 235.000 240.000 245.000 250.000 250.000 252.500 255.000 257.500 260.000 262.143 264.286 266.429 268.571 270.714 272.857 275.000 275.000 275.000 275.000 275.000 280.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 292.000 294.000 296.000 298.000 300.000 300.000 300.000 300.000 300.000 302.143 304.286 306.429 308.571 310.714 312.857 315.000 315.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 346.667 348.333 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 370.000 375.000 375.000 375.000 376.667 378.333 380.000 380.000 380.000 380.000 380.000 381.250 382.500 383.750 385.000 385.000 387.500 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 402.500 405.000 407.500 410.000 405.000 405.625 406.250 406.875 407.500 408.125 408.750 409.375 415.000 420.000 420.000 420.000 421.667 423.333 425.000 425.000 425.000 427.500 430.000 430.000 430.000 435.000 435.000 436.250 437.500 438.750 440.000 440.000 445.000 450.000 447.500 445.000 450.000 452.500 455.000 457.500 460.000 461.549 463.279 465.224 467.428 469.945 472.848 476.232 480.228 485.018 490.865 498.163 507.527 519.981
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 48 51 0 48 48 0 0 0 51 0 48 0 0 51 0 51 54 57 60 57 57 60 51 60 60 60 60 54 60 0 0 0 0 51 60 60 57 48 0 57 0 0 0 0 51 60 54 57 60 54 60 66 60 57 63 63 57 60 57 60 66 72 75 72 69 69 66 0 0 72 78 75 72 78 75 72 72 72 0 72 69 72 72 69 0 0 51 69 66 69 69 0 0 69 75 75 72 66 0 0 0 66 60 0 0 60 0 63 63 60 57 51 63 66 63 60 63 63 0 60 48 54 0 60 0 0 54 0 0 0 0 0 0 0 54 42 0 51 0 0 42 0 48 0 42 0 54 42 45 0 0 0 54 57 54 42 0 57 63 0 60 54 57 0 0 48 48 45 42 0 0 42 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.953125 1.953125 0.390625 2.734375 0.390625 2.734375 -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 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -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 -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 -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 -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 -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 -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 1.171875 -0.390625 -0.390625 -0.390625 1.953125 -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 0.390625 -0.390625 2.734375 1.171875 -2.734375
</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" >
89.555 90.0 95.0 100.0 105.0 110.0 113.461 115.0 116.922 120.0 120.383 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 348.471 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.236 1.98 2.55 2.85 2.946 2.824 2.824 2.824 2.932 2.946 3.074 3.216 3.361 3.51 3.662 3.819 3.98 4.145 4.314 4.488 4.666 4.848 5.034 5.225 5.421 5.62 5.824 6.033 6.246 6.463 6.685 6.911 7.142 7.377 7.617 7.861 8.11 8.364 8.623 8.888 9.157 9.432 9.712 9.998 10.29 10.587 10.89 11.197 11.508 11.82 12.13 12.428 12.702 12.927 13.069 13.1 13.099 13.081 13.041 12.982 12.903 12.808 12.697 12.572 12.433 12.283 12.123 11.953 11.774 11.589 11.397 11.2 10.998 10.793 10.585 10.375 10.163 9.95 9.737 9.524 9.312 9.1 8.89 8.681 8.475 8.27 8.068 7.869 7.672 7.479 7.288 7.101 6.917 6.736 6.559 6.386 6.216 6.049 5.886 5.727 5.571 5.419 5.27 5.125 4.983 4.845 4.71 4.578 4.45 4.325 4.203 4.084 3.969 3.856 3.747 3.64 3.536 3.435 3.337 3.241 3.148 3.058 2.97 2.884 2.801 2.72 2.642 2.565 2.491 2.419 2.349 2.281 2.215 2.15 2.088 2.027 1.968 1.911 1.855 1.801 1.749 1.698 1.648 1.6 1.553 1.508 1.464 1.421 1.38 1.339 1.3 1.262 1.225 1.19 1.155 1.121 1.088 1.056 1.025 0.995 0.966 0.938 0.91 0.884 0.858 0.833 0.808 0.785 0.762 0.739 0.718 0.697 0.676 0.656 0.637 0.618 0.6 0.583 0.566 0.549 0.533 0.517 0.502 0.487 0.473 0.459 0.446

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.946" PeakHeight="110.0" Num="3" Error="0.0">
-30.149 12.635 -2.931
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.946" EndFrequency="13.1" PeakHeight="348.471" Num="5" zHalfNm="276.938" Error="1.991">
-174.175 -67.44 16.188 -3.165 0.504
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="10.383" Depth="0.122"/>
<TopsideChapman PeakHeight="348.471" PeakDensity="2129156.2" PeakScaleHeight="52.472" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
