<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 20:30:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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) 20:30:00</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">
FF202605902282030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.978" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.483" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="410.000" 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="1.933" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="314.480" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="257.397" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.366" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="78.098" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.580" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="41.088" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="100.990" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.100" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="128">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 256.154 257.308 258.462 259.615 260.769 261.923 263.077 264.231 265.385 266.538 267.692 268.846 270.000 270.000 270.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 281.667 283.333 285.000 285.000 285.000 286.667 288.333 290.000 291.667 293.333 295.000 295.000 295.000 296.000 297.000 298.000 299.000 300.000 300.000 302.500 305.000 307.500 310.000 310.000 311.000 312.000 313.000 314.000 315.000 316.000 317.000 318.000 319.000 320.000 320.000 320.000 325.000 330.000 330.000 331.250 332.500 333.750 335.000 335.000 337.500 340.000 340.000 340.000 340.000 340.000 342.000 344.000 346.000 348.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 372.500 375.000 375.000 377.500 380.000 380.000 382.500 385.000 385.000 385.000 385.000 385.000 385.000 390.000 385.000 385.000 387.500 390.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 405.000 407.500 410.000 415.175 422.930 435.834 461.566
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 51 0 48 0 0 48 0 0 0 0 54 0 0 48 60 60 0 48 51 51 0 57 0 0 0 54 57 60 0 0 0 0 0 51 63 63 0 0 0 0 66 69 0 0 0 60 66 0 0 57 0 0 69 0 60 0 60 48 60 45 57 60 0 0 0 60 63 48 60 63 69 69 60 0 0 63 0 66 69 66 66 66 60 63 51 57 60 54 63 66 0 60 63 0 54 63 0 51 57 63 66 54 69 66 69 57 0 72 72 75 72 0 69 72 57 0 72 66 66 72 0 60 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 -2.734375 -0.390625 -0.390625 -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 -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 -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 2.734375 0.390625 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="166">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.78 90.0 95.0 100.0 105.0 110.0 115.0 118.582 120.0 125.0 127.165 130.0 135.0 135.747 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 314.48 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.219 1.295 1.674 1.871 1.933 1.888 1.799 1.799 1.799 1.799 1.843 1.921 1.933 2.079 2.239 2.397 2.555 2.716 2.882 3.053 3.231 3.416 3.608 3.807 4.013 4.226 4.444 4.669 4.898 5.133 5.371 5.613 5.859 6.108 6.361 6.616 6.875 7.137 7.403 7.673 7.947 8.225 8.508 8.794 9.082 9.365 9.627 9.83 9.9 9.9 9.883 9.84 9.773 9.684 9.576 9.451 9.31 9.156 8.99 8.815 8.631 8.441 8.245 8.046 7.843 7.639 7.433 7.228 7.022 6.819 6.616 6.417 6.219 6.025 5.834 5.647 5.464 5.285 5.11 4.939 4.772 4.61 4.452 4.298 4.149 4.005 3.864 3.728 3.596 3.469 3.345 3.225 3.11 2.998 2.89 2.785 2.684 2.587 2.492 2.402 2.314 2.229 2.147 2.069 1.993 1.919 1.849 1.781 1.715 1.652 1.591 1.532 1.475 1.42 1.368 1.317 1.268 1.221 1.176 1.132 1.09 1.05 1.011 0.973 0.937 0.902 0.868 0.836 0.805 0.775 0.746 0.718 0.692 0.666 0.641 0.617 0.594 0.572 0.551 0.53 0.51 0.491 0.473 0.455 0.438 0.422 0.406 0.391 0.377 0.363 0.349 0.336 0.324 0.311 0.3 0.289 0.278 0.268 0.258 0.248 0.239 0.23 0.221 0.213 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.933" PeakHeight="110.0" Num="3" Error="0.0">
-28.962 10.975 -2.233
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.933" EndFrequency="9.9" PeakHeight="314.48" Num="5" zHalfNm="257.397" Error="2.103">
-141.487 -51.337 17.325 -4.98 1.746
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="25.747" Depth="0.134"/>
<TopsideChapman PeakHeight="314.48" PeakDensity="1216005.0" PeakScaleHeight="41.088" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
