<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 20:10:00.000"
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 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) 20:10:00</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">
FF202605902282010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.794" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.833" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="11.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="447.032" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.193" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="347.425" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="280.540" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.442" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="92.495" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.456" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="48.705" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="116.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="172">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.2 3.25 3.3 3.35 3.4 3.45 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 240.000 241.250 242.500 243.750 245.000 245.000 250.000 250.000 250.000 252.500 255.000 256.000 257.000 258.000 259.000 260.000 260.000 260.000 260.000 262.500 265.000 265.000 265.000 266.250 267.500 268.750 270.000 272.500 275.000 275.000 275.000 275.000 275.000 275.000 277.500 280.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 291.667 293.333 295.000 296.667 298.333 300.000 305.000 305.000 305.000 305.000 307.500 310.000 312.500 315.000 315.000 316.500 318.000 319.500 321.000 322.500 324.000 325.500 327.000 328.500 330.000 330.000 331.429 332.857 334.286 335.714 337.143 338.571 340.000 340.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 377.500 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 405.000 405.000 407.500 410.000 412.500 415.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 421.250 422.500 423.750 425.000 425.000 425.000 430.000 432.500 435.000 435.630 436.331 437.114 437.997 438.997 440.142 441.464 443.008 444.835 447.032 449.722 453.093 457.442 463.265 471.465 483.869 504.830 547.858
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 0 0 54 54 51 0 60 0 54 0 0 0 0 54 54 51 57 0 60 66 66 0 0 0 63 0 54 0 60 0 60 54 0 66 66 72 75 69 66 69 69 0 0 0 60 0 0 54 0 66 51 0 0 0 0 0 0 0 0 0 0 51 0 60 0 48 48 0 0 0 0 57 0 60 66 54 63 69 57 66 69 57 54 66 54 60 66 57 63 69 72 75 69 72 72 66 51 72 0 72 69 60 63 69 72 69 72 72 75 75 75 75 78 75 0 78 72 75 0 78 75 75 72 0 69 72 72 0 69 0 72 0 60 63 0 0 69 66 63 60 60 60 0 0 0 51 51 51 51 0 42 48 0 54 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -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 -0.390625 0.390625 -0.390625 1.171875 1.171875 -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 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 -2.734375 -1.953125 2.734375 1.171875 -1.953125 1.953125
</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" >
89.71 90.0 95.0 100.0 105.0 110.0 115.0 117.165 120.0 124.331 125.0 130.0 131.496 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.425 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.225 1.471 1.899 2.122 2.193 2.131 2.064 2.064 2.064 2.076 2.166 2.193 2.273 2.394 2.521 2.656 2.799 2.949 3.108 3.273 3.447 3.627 3.815 4.009 4.209 4.415 4.626 4.842 5.063 5.288 5.517 5.75 5.987 6.227 6.471 6.718 6.969 7.223 7.482 7.743 8.009 8.279 8.553 8.832 9.114 9.401 9.693 9.988 10.285 10.583 10.877 11.159 11.414 11.619 11.735 11.75 11.747 11.723 11.678 11.612 11.528 11.427 11.31 11.179 11.036 10.881 10.717 10.544 10.364 10.178 9.986 9.79 9.59 9.388 9.184 8.979 8.773 8.567 8.361 8.157 7.954 7.753 7.553 7.357 7.162 6.971 6.782 6.597 6.415 6.237 6.062 5.89 5.722 5.558 5.398 5.241 5.088 4.939 4.793 4.652 4.513 4.379 4.247 4.12 3.996 3.875 3.757 3.643 3.532 3.424 3.32 3.218 3.119 3.023 2.93 2.839 2.752 2.666 2.584 2.504 2.426 2.35 2.277 2.206 2.138 2.071 2.006 1.944 1.883 1.824 1.767 1.711 1.658 1.606 1.555 1.507 1.459 1.414 1.369 1.326 1.284 1.244 1.205 1.167 1.13 1.095 1.06 1.027 0.995 0.963 0.933 0.904 0.875 0.847 0.821 0.795 0.77 0.746 0.722 0.699 0.677 0.656 0.635 0.615 0.596 0.577 0.559 0.541 0.524 0.508 0.492 0.476 0.461 0.446 0.432 0.419 0.406 0.393 0.38 0.368 0.357 0.345 0.335 0.324 0.314 0.304 0.294

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.193" PeakHeight="110.0" Num="3" Error="0.0">
-29.344 11.493 -2.439
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.193" EndFrequency="11.75" PeakHeight="347.425" Num="5" zHalfNm="280.54" Error="1.857">
-170.144 -58.282 17.394 -5.581 0.684
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="21.496" Depth="0.129"/>
<TopsideChapman PeakHeight="347.425" PeakDensity="1712934.2" PeakScaleHeight="48.705" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
