<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-18 -049 21:40:00.000"
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="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 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" >
2026.02.18 (049) 21:40:00</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">
FF202604902182140009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.282" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.649" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="305.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" 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="8.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="540.000" 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="0.629" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="461.918" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="344.234" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.032" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="169.218" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.031" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="86.898" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="159.730" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.400" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 315.000 310.000 311.429 312.857 314.286 315.714 317.143 318.571 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 335.000 335.000 336.250 337.500 338.750 340.000 341.250 342.500 343.750 345.000 346.250 347.500 348.750 350.000 345.000 350.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 360.000 365.000 367.000 369.000 371.000 373.000 375.000 375.000 375.000 377.500 380.000 385.000 385.000 386.667 388.333 390.000 392.500 395.000 395.000 395.000 400.000 401.667 403.333 405.000 406.667 408.333 410.000 412.500 415.000 415.000 416.667 418.333 420.000 425.000 428.333 431.667 435.000 438.333 441.667 445.000 445.000 445.000 450.000 452.500 455.000 460.000 465.000 465.000 469.000 473.000 477.000 481.000 485.000 490.000 500.000 505.000 510.000 510.000 515.000 520.000 525.000 530.000 535.000 540.000 548.333 556.667 565.000 570.000 575.000 585.000 595.000 600.000 610.000 620.000 625.000 638.750 652.500 666.250 680.000 680.000 695.000 710.000 730.078 753.766
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 66 0 0 63 63 69 72 0 0 0 0 0 0 75 72 81 0 0 0 0 0 66 0 75 0 72 63 69 0 0 48 0 0 54 0 0 0 0 0 69 66 0 57 54 0 54 0 0 69 69 69 66 0 0 0 0 63 69 72 0 60 48 54 0 0 66 51 51 57 63 57 0 0 66 0 0 66 0 60 63 0 0 57 57 0 0 0 54 0 51 57 57 60 0 57 60 63 60 0 0 0 0 66 66 63 60 60 66 66 66 63 57 60 54 54 0 48 51 54 63 60 57 60 60 57 54 0 0 48 60 0 54 60 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.993 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.094 140.0 145.0 150.0 155.0 160.0 162.189 165.0 170.0 175.0 180.0 185.0 188.283 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 461.918 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.417 0.545 0.609 0.629 0.62 0.593 0.544 0.467 0.341 0.301 0.301 0.301 0.301 0.301 0.301 0.301 0.336 0.399 0.462 0.525 0.588 0.629 0.662 0.745 0.822 0.9 0.981 1.068 1.162 1.268 1.386 1.52 1.674 1.85 2.051 2.276 2.522 2.782 3.048 3.315 3.577 3.834 4.084 4.326 4.562 4.791 5.014 5.231 5.442 5.649 5.85 6.047 6.24 6.428 6.611 6.791 6.966 7.136 7.301 7.462 7.618 7.768 7.912 8.05 8.182 8.306 8.423 8.531 8.631 8.721 8.802 8.872 8.931 8.979 9.015 9.038 9.049 9.05 9.049 9.043 9.031 9.013 8.991 8.964 8.932 8.896 8.856 8.811 8.763 8.711 8.656 8.598 8.537 8.472 8.406 8.337 8.265 8.192 8.116 8.039 7.96 7.879 7.798 7.715 7.631 7.546 7.46 7.373 7.286 7.199 7.11 7.022 6.933 6.845 6.756 6.667 6.578 6.489 6.401 6.312 6.225 6.137 6.05 5.963 5.877 5.791 5.706 5.622 5.538 5.455 5.373 5.291 5.21 5.13 5.05 4.972 4.894 4.817 4.741 4.666 4.592 4.518 4.446 4.374 4.303 4.233 4.164 4.096 4.029 3.963 3.898 3.833 3.769 3.707 3.645 3.584 3.524 3.465 3.406 3.349 3.292 3.237 3.182 3.128 3.074 3.022 2.97 2.92 2.87 2.82 2.772 2.724 2.677 2.631 2.586 2.541 2.497 2.454 2.411 2.369 2.328 2.288 2.248 2.209 2.17 2.133

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.629" PeakHeight="110.0" Num="3" Error="0.0">
-23.987 5.615 -0.635
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.629" EndFrequency="9.05" PeakHeight="461.918" Num="5" zHalfNm="344.234" Error="8.07">
-295.948 26.925 -1.222 -8.705 5.315
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="78.283" Depth="0.328"/>
<TopsideChapman PeakHeight="461.918" PeakDensity="1016160.06" PeakScaleHeight="86.898" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
