<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 17:30:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 17:30:00</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">
FF202605902281730009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="13.650" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.587" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="35.308" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="14.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" 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="3.188" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.266" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="373.423" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="288.634" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.309" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="116.103" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="66.102" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="64.563" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="149.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.200" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="175">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 13.15 13.2 13.25 13.3 13.35 13.4 13.45 13.5 13.55 13.6 13.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 270.000 272.500 275.000 285.000 285.000 285.000 285.000 290.000 290.000 295.000 295.000 300.000 305.000 305.000 305.000 306.818 308.636 310.455 312.273 314.091 315.909 317.727 319.545 321.364 323.182 325.000 325.000 326.429 327.857 329.286 330.714 332.143 333.571 335.000 336.429 337.857 339.286 340.714 342.143 343.571 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 351.364 352.727 354.091 355.455 356.818 358.182 359.545 360.909 362.273 363.636 365.000 365.000 365.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 402.500 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 426.250 427.500 428.750 430.000 431.667 433.333 435.000 436.667 438.333 440.000 440.000 441.429 442.857 444.286 445.714 447.143 448.571 450.000 450.000 455.000 455.000 460.000 465.000 465.000 467.500 470.000 475.000 475.000 475.000 480.000 485.000 485.000 490.000 490.000 495.000 505.000 505.000 510.000 514.315 519.192 524.748 531.137 538.560 547.291 557.708 570.354 586.027 605.964
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 0 48 48 51 0 54 60 60 60 57 60 54 60 54 0 0 0 0 0 0 0 0 0 0 54 51 0 51 0 0 45 0 0 45 0 54 0 0 0 57 54 51 57 0 54 0 60 0 57 0 54 0 0 0 0 48 0 54 48 54 63 66 66 63 63 66 66 66 63 54 51 0 57 54 0 66 66 57 57 60 48 0 48 48 54 54 54 48 45 51 54 54 51 51 54 0 57 0 54 0 51 51 45 45 54 0 51 45 48 51 0 0 54 0 51 54 0 0 0 57 57 54 57 54 54 0 0 0 51 0 0 51 0 0 48 48 0 0 0 0 0 0 51 51 54 54 54 45 54 45 51 45 54 54 54 48 51 51 51 54 45 57 57 54 51 51 51 51 48 51 48 51 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -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 -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
</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" >
89.515 90.0 95.0 100.0 105.0 110.0 112.393 114.786 115.0 117.179 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 373.423 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.144 2.759 3.084 3.188 3.066 3.066 3.077 3.188 3.288 3.453 3.609 3.759 3.906 4.051 4.196 4.34 4.486 4.633 4.782 4.933 5.086 5.243 5.403 5.566 5.734 5.905 6.081 6.262 6.448 6.639 6.836 7.039 7.248 7.464 7.686 7.915 8.152 8.396 8.648 8.907 9.174 9.448 9.73 10.018 10.311 10.61 10.913 11.217 11.521 11.821 12.116 12.399 12.667 12.914 13.135 13.323 13.473 13.579 13.638 13.65 13.649 13.636 13.609 13.567 13.512 13.444 13.364 13.274 13.173 13.063 12.944 12.817 12.682 12.541 12.394 12.242 12.084 11.922 11.757 11.588 11.416 11.242 11.066 10.889 10.71 10.53 10.35 10.169 9.989 9.809 9.629 9.45 9.272 9.095 8.92 8.746 8.573 8.402 8.233 8.066 7.901 7.738 7.577 7.419 7.262 7.108 6.957 6.808 6.661 6.516 6.374 6.235 6.098 5.963 5.831 5.701 5.574 5.449 5.327 5.207 5.089 4.974 4.86 4.75 4.641 4.535 4.431 4.329 4.23 4.132 4.037 3.943 3.852 3.762 3.675 3.589 3.506 3.424 3.344 3.266 3.189 3.114 3.041 2.97 2.9 2.832 2.765 2.7 2.636 2.574 2.514 2.454 2.396 2.339 2.284 2.23 2.177 2.126 2.075 2.026 1.978 1.931 1.885 1.84 1.797 1.754 1.712 1.672 1.632 1.593 1.555 1.518 1.482 1.447 1.412 1.379 1.346 1.314 1.282 1.252 1.222 1.193 1.164 1.137 1.11 1.083

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.188" PeakHeight="110.0" Num="3" Error="0.0">
-30.348 12.927 -3.064
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.188" EndFrequency="13.65" PeakHeight="373.423" Num="5" zHalfNm="288.634" Error="2.961">
-205.406 -60.979 6.553 3.076 0.512
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.179" Depth="0.122"/>
<TopsideChapman PeakHeight="373.423" PeakDensity="2311693.5" PeakScaleHeight="64.563" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
