<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-19 -050 19:40:00.000"
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 0 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" >
2026.02.19 (050) 19:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202605002191940009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.925" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="35.099" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.350" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.660" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.300" 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="24" Val="111.616" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="103.427" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="13.169" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="427.185" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.497" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="325.937" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="272.188" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.536" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="71.861" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="32.464" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="39.208" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="102.240" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="176">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.8 11.85 11.9 11.95 12.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 225.000 225.000 235.000 235.000 237.500 240.000 242.500 245.000 245.000 250.000 250.000 255.000 255.000 257.500 260.000 260.000 260.000 260.000 260.000 265.000 270.000 272.500 275.000 276.250 277.500 278.750 280.000 280.000 280.000 280.000 285.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.833 311.667 312.500 313.333 314.167 315.000 315.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 352.500 355.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 382.500 380.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 391.000 392.000 393.000 394.000 395.000 395.000 400.000 401.667 403.333 405.000 405.000 405.000 407.500 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 416.450 418.076 419.912 422.002 424.401 427.185 430.453 434.344 439.055 444.876
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 54 48 66 0 0 0 54 60 57 60 54 57 0 57 60 51 63 51 0 66 51 57 0 0 0 60 60 0 60 0 0 0 60 0 0 60 57 51 66 63 63 66 66 66 0 0 0 0 66 0 0 69 0 66 0 0 0 69 66 66 69 69 69 66 69 69 69 69 69 69 72 69 69 66 69 69 69 66 69 69 69 69 66 69 72 72 69 72 72 72 72 69 72 60 0 75 75 78 75 72 72 72 63 0 72 69 72 72 0 75 72 72 69 66 72 0 69 72 69 66 66 69 57 54 69 69 66 63 66 63 0 66 66 0 66 0 60 60 0 60 63 60 0 0 0 0 57 57 54 0 0 45 0 54 0 45 0 0 54 54 51 54 57 54 0 0 54 0 54 0 57 0 42 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 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 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 1.171875 2.734375 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 2.45 2.5 2.55 2.6 2.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
111.616 112.592 113.726 115.084 116.789 119.116 122.931
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 0 51 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-2.734375 -2.734375 -1.953125 1.171875 1.953125 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="168">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 103.427 105.0 109.024 110.0 114.62 115.0 120.0 120.217 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 325.937 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.053 2.566 2.66 2.65 2.527 2.527 2.527 2.536 2.655 2.66 2.758 2.864 2.973 3.085 3.201 3.322 3.447 3.578 3.714 3.857 4.006 4.162 4.325 4.495 4.674 4.861 5.056 5.26 5.472 5.693 5.922 6.16 6.406 6.661 6.923 7.194 7.472 7.757 8.05 8.351 8.66 8.977 9.302 9.637 9.982 10.337 10.703 11.078 11.453 11.795 11.994 12.0 11.988 11.94 11.861 11.752 11.616 11.458 11.279 11.082 10.87 10.645 10.41 10.167 9.917 9.662 9.403 9.143 8.882 8.621 8.361 8.103 7.848 7.597 7.35 7.106 6.868 6.635 6.407 6.185 5.968 5.757 5.552 5.352 5.159 4.971 4.789 4.613 4.443 4.278 4.119 3.964 3.816 3.672 3.533 3.4 3.271 3.146 3.026 2.911 2.799 2.692 2.589 2.489 2.394 2.301 2.213 2.127 2.045 1.966 1.89 1.817 1.746 1.679 1.613 1.551 1.491 1.433 1.377 1.323 1.272 1.222 1.175 1.129 1.085 1.043 1.002 0.963 0.926 0.89 0.855 0.822 0.789 0.759 0.729 0.701 0.673 0.647 0.622 0.597 0.574 0.552 0.53 0.51 0.49 0.471 0.452 0.434 0.418 0.401 0.386 0.37 0.356 0.342 0.329 0.316 0.304 0.292 0.28 0.269 0.259 0.249 0.239 0.23 0.221 0.212 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.66" PeakHeight="103.427" Num="3" Error="3.894">
-19.675 8.065 -1.817
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.66" EndFrequency="12.0" PeakHeight="325.937" Num="5" zHalfNm="272.188" Error="1.742">
-141.22 -72.568 11.266 -4.514 1.316
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.79" Depth="0.133"/>
<TopsideChapman PeakHeight="325.937" PeakDensity="1786600.5" PeakScaleHeight="39.208" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
