<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-10 -041 22:00:00.000"
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" >
2026.02.10 (041) 22:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202604102102200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.441" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.582" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="0.500" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.840" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.413" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="445.953" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.266" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.910" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="105.226" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="24.409" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="53.723" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="107.680" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.770" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="149">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 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 9.1 9.15 9.2 9.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 345.000 345.556 346.111 346.667 347.222 347.778 348.333 348.889 349.444 350.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.833 361.667 362.500 363.333 364.167 365.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 371.250 372.500 373.750 375.000 376.250 377.500 378.750 380.000 380.000 385.000 385.000 382.500 380.000 390.000 390.000 390.000 391.000 392.000 393.000 394.000 395.000 395.714 396.429 397.143 397.857 398.571 399.286 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 417.000 419.000 421.000 423.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 435.000 440.000 440.000 440.000 440.000 445.000 445.000 445.000 450.000 451.250 452.500 453.750 455.000 455.000 458.000 461.000 464.000 467.000 470.000 471.667 473.333 475.000 475.000 480.000 480.000 485.000 485.000 485.000 490.000 495.000 495.000 500.000 500.000 505.000 505.000 510.000 510.000 515.000 520.000 520.000 525.000 525.000 527.762 530.840 534.291 538.186 542.619 547.708 553.611 560.539 568.787 578.769 591.098 606.711 627.123
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0 54 0 0 63 0 0 63 60 0 0 60 60 66 69 72 72 0 66 60 0 0 0 0 66 0 0 0 0 0 51 54 51 0 0 51 51 48 0 51 0 0 0 0 0 60 63 48 51 0 0 48 51 54 0 0 0 0 57 0 57 0 0 0 0 57 0 54 51 0 57 54 0 60 63 57 60 57 0 0 0 0 60 63 66 66 57 60 63 54 57 63 54 60 63 63 60 63 60 57 0 0 0 60 57 0 0 0 0 54 0 0 54 57 54 60 57 63 63 63 54 60 54 60 54 60 57 60 57 57 57 57 54 54 57 54 57 54 57 57 60 48 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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 0.390625 1.171875 -1.171875 -0.390625 -1.171875 0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 1.953125 2.734375 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 2.734375 -1.171875 -0.390625 -1.171875
</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" >
92.496 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.137 140.0 145.0 150.0 155.0 160.0 165.0 168.274 170.0 175.0 180.0 185.0 190.0 195.0 197.411 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 445.953 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.273 0.358 0.4 0.413 0.408 0.394 0.369 0.33 0.273 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.213 0.249 0.286 0.322 0.359 0.395 0.413 0.453 0.521 0.586 0.651 0.717 0.787 0.861 0.94 1.024 1.114 1.211 1.315 1.428 1.549 1.679 1.82 1.971 2.132 2.305 2.488 2.683 2.889 3.106 3.332 3.569 3.814 4.068 4.329 4.598 4.872 5.151 5.434 5.72 6.008 6.296 6.583 6.867 7.147 7.421 7.686 7.94 8.181 8.404 8.608 8.789 8.944 9.07 9.164 9.225 9.249 9.25 9.245 9.225 9.192 9.145 9.086 9.016 8.936 8.847 8.749 8.643 8.53 8.411 8.287 8.158 8.026 7.889 7.75 7.608 7.464 7.319 7.173 7.027 6.88 6.733 6.586 6.44 6.295 6.151 6.008 5.867 5.727 5.589 5.453 5.319 5.187 5.057 4.93 4.804 4.681 4.561 4.442 4.326 4.213 4.101 3.993 3.886 3.782 3.681 3.582 3.485 3.39 3.298 3.208 3.12 3.034 2.951 2.869 2.79 2.712 2.637 2.564 2.492 2.423 2.355 2.289 2.225 2.162 2.102 2.043 1.985 1.929 1.875 1.822 1.77 1.72 1.671 1.624 1.578 1.533 1.49 1.447 1.406 1.366 1.327 1.29 1.253 1.217 1.183 1.149 1.116 1.084 1.053 1.023 0.994 0.966 0.938 0.911 0.885 0.86 0.835 0.812 0.788 0.766 0.744 0.723 0.702 0.682 0.662 0.643 0.625 0.607

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.413" PeakHeight="110.0" Num="3" Error="0.0">
-20.549 3.287 -0.242
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.413" EndFrequency="9.25" PeakHeight="445.953" Num="5" zHalfNm="374.266" Error="4.843">
-231.856 -23.516 5.639 -0.883 2.074
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.411" Depth="0.213"/>
<TopsideChapman PeakHeight="445.953" PeakDensity="1061569.5" PeakScaleHeight="53.723" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
