<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 19:50:00.000"
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 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.02.23 (054) 19:50:00</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">
FF202605402231950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.515" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.034" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.150" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.210" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="114.744" Name="h`E" 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="0.650" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="515.000" 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="2.406" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="370.387" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="270.256" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.508" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="135.833" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.192" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="71.051" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="156.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.450" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="138">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 245.000 245.000 250.000 250.000 250.000 252.500 255.000 260.000 261.250 262.500 263.750 265.000 270.000 270.000 270.000 272.000 274.000 276.000 278.000 280.000 281.250 282.500 283.750 285.000 286.250 287.500 288.750 290.000 291.250 292.500 293.750 295.000 300.000 301.429 302.857 304.286 305.714 307.143 308.571 310.000 310.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 320.000 322.500 325.000 320.000 322.500 325.000 327.500 330.000 332.500 335.000 337.500 340.000 342.500 345.000 347.000 349.000 351.000 353.000 355.000 355.000 357.500 360.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 470.000 475.000 480.000 480.000 485.000 490.000 490.000 495.000 495.000 500.000 505.000 510.000 515.000 515.000 518.903 523.320 528.361 534.168 540.930 548.903 558.444 570.069 584.540 603.052
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 51 54 51 0 51 0 0 0 0 48 54 0 60 0 0 60 0 54 0 0 0 0 0 0 0 0 0 0 0 63 54 0 0 0 0 0 0 0 0 0 0 0 0 0 66 63 69 0 63 0 0 0 0 0 66 0 0 69 0 66 0 0 66 0 66 72 63 69 60 66 54 66 72 63 69 63 69 63 72 63 72 66 72 66 72 66 75 69 75 69 60 72 72 72 63 69 63 54 63 66 63 69 63 69 63 54 60 66 63 51 60 63 63 57 60 60 54 60 60 54 60 57 0 54 54 51 54 0 54 54 51 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 -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 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.171875 0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
114.744 115.513
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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" >
89.705 90.0 95.0 100.0 105.0 110.0 115.0 116.054 120.0 122.109 125.0 128.163 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 370.387 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.225 1.482 1.914 2.139 2.21 2.132 2.095 2.095 2.095 2.15 2.21 2.256 2.381 2.506 2.635 2.768 2.907 3.053 3.207 3.369 3.541 3.721 3.91 4.106 4.308 4.514 4.724 4.934 5.145 5.354 5.561 5.766 5.968 6.168 6.364 6.558 6.749 6.938 7.125 7.309 7.492 7.673 7.852 8.03 8.207 8.382 8.557 8.73 8.903 9.074 9.243 9.411 9.575 9.734 9.886 10.028 10.154 10.255 10.323 10.35 10.35 10.346 10.332 10.309 10.277 10.238 10.19 10.135 10.073 10.005 9.93 9.85 9.765 9.675 9.581 9.482 9.38 9.275 9.166 9.055 8.941 8.826 8.708 8.589 8.468 8.346 8.224 8.1 7.977 7.852 7.728 7.604 7.48 7.356 7.232 7.109 6.987 6.865 6.744 6.624 6.506 6.388 6.271 6.156 6.041 5.928 5.817 5.707 5.598 5.49 5.384 5.28 5.177 5.075 4.975 4.877 4.78 4.685 4.591 4.499 4.408 4.319 4.231 4.145 4.06 3.977 3.895 3.815 3.736 3.659 3.583 3.509 3.436 3.364 3.294 3.225 3.157 3.091 3.026 2.962 2.899 2.838 2.778 2.719 2.662 2.605 2.55 2.496 2.442 2.39 2.339 2.289 2.241 2.193 2.146 2.1 2.055 2.011 1.968 1.925 1.884 1.844 1.804 1.765 1.727 1.69 1.653 1.618 1.583 1.549 1.515 1.483 1.451 1.419 1.389 1.359 1.329 1.301 1.272 1.245 1.218 1.192 1.166 1.141 1.116 1.092 1.068

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.21" PeakHeight="110.0" Num="3" Error="0.0">
-29.367 11.524 -2.452
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.21" EndFrequency="10.35" PeakHeight="370.387" Num="5" zHalfNm="270.256" Error="4.197">
-212.58 -43.736 22.647 -11.872 3.317
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.163" Depth="0.115"/>
<TopsideChapman PeakHeight="370.387" PeakDensity="1329063.2" PeakScaleHeight="71.051" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
