<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-04 -035 21:20:00.000"
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" >
2026.02.04 (035) 21:20:00</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">
FF202603502042120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="9.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.217" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.054" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="95.000" Name="h`Es" 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="9.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="642.216" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.020" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="468.724" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="360.758" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.138" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.100" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="155.531" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.276" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.177" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.960" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.590" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="142">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 315.000 315.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 331.923 333.846 335.769 337.692 339.615 341.538 343.462 345.385 347.308 349.231 351.154 353.077 355.000 350.000 350.000 360.000 355.000 357.500 360.000 362.500 365.000 367.500 370.000 370.000 370.000 370.000 375.000 376.429 377.857 379.286 380.714 382.143 383.571 385.000 385.000 387.500 390.000 395.000 397.500 400.000 405.000 405.000 405.000 405.000 410.000 412.500 415.000 417.500 420.000 425.000 427.500 430.000 432.500 435.000 437.500 440.000 440.000 445.000 450.000 455.000 460.000 460.000 460.000 465.000 470.000 475.000 475.000 480.000 480.000 485.000 490.000 490.000 493.333 496.667 500.000 503.333 506.667 510.000 510.000 515.000 515.000 515.000 520.000 525.000 525.000 530.000 530.000 530.000 535.000 535.000 540.000 545.000 545.000 550.000 553.750 557.500 561.250 565.000 565.000 565.000 570.000 575.000 575.000 580.000 585.000 585.000 590.000 590.000 595.000 600.000 605.000 605.000 610.000 615.000 617.500 620.000 624.818 630.081 635.854 642.216 649.261 657.104 665.891 675.802 687.068 699.987 714.952
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 63 66 66 69 0 72 69 72 72 72 69 0 72 72 0 0 0 0 0 0 0 0 0 0 48 0 54 0 0 54 0 0 0 0 0 0 57 63 66 66 63 0 0 0 57 0 0 66 0 0 0 69 0 72 66 0 72 0 72 54 72 0 72 72 0 0 0 57 0 66 0 0 66 66 60 63 57 63 60 60 66 63 63 0 60 63 0 0 0 0 0 54 63 54 0 66 0 54 63 57 45 66 66 66 69 60 66 63 0 0 0 48 60 63 63 54 63 57 51 60 57 63 63 60 57 63 66 60 0 57 60 57 57 0 0 0 0 54 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="37">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.000 95.000 95.000 95.000 95.000 95.000 95.000 100.000 100.000 100.385 100.769 101.154 101.538 101.923 102.308 102.692 103.077 103.462 103.846 104.231 104.615 105.000 100.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 100.000 100.833 101.667 102.500 103.333 104.167 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 0 0 0 0 66 57 54 0 0 0 0 0 60 0 0 0 0 0 0 57 66 60 0 51 0 0 0 51 0 0 0 0 51 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 2.734375 -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 1.171875 -1.953125 -2.734375 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 1.953125 0.390625 -2.734375 -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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.25 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.528 130.0 135.0 140.0 143.057 145.0 150.0 155.0 159.585 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 468.724 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.679 0.884 0.987 1.02 1.003 0.95 0.855 0.816 0.816 0.816 0.816 0.816 0.84 0.902 0.963 1.02 1.029 1.126 1.211 1.292 1.374 1.458 1.544 1.636 1.732 1.836 1.947 2.066 2.195 2.333 2.482 2.641 2.81 2.986 3.168 3.355 3.544 3.734 3.923 4.111 4.298 4.482 4.664 4.843 5.02 5.194 5.367 5.538 5.706 5.873 6.039 6.204 6.367 6.529 6.691 6.851 7.011 7.171 7.33 7.489 7.648 7.806 7.964 8.122 8.28 8.437 8.594 8.749 8.903 9.056 9.204 9.349 9.486 9.614 9.729 9.826 9.898 9.94 9.95 9.95 9.944 9.93 9.909 9.88 9.846 9.804 9.757 9.704 9.645 9.582 9.514 9.441 9.364 9.283 9.199 9.112 9.021 8.928 8.833 8.735 8.635 8.533 8.43 8.325 8.219 8.112 8.004 7.895 7.786 7.677 7.567 7.457 7.347 7.237 7.127 7.017 6.908 6.799 6.691 6.584 6.477 6.371 6.266 6.161 6.058 5.955 5.854 5.753 5.654 5.555 5.458 5.362 5.267 5.174 5.081 4.99 4.9 4.811 4.723 4.637 4.552 4.468 4.386 4.304 4.224 4.145 4.068 3.992 3.916 3.843 3.77 3.698 3.628 3.559 3.491 3.424 3.359 3.294 3.231 3.169 3.108 3.048 2.989 2.931 2.874 2.818 2.763 2.709 2.657 2.605 2.554 2.504 2.455 2.407 2.36 2.313 2.268 2.223 2.18 2.137 2.094 2.053 2.013 1.973 1.934 1.896

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.02" PeakHeight="110.0" Num="3" Error="0.0">
-26.592 8.091 -1.249
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.02" EndFrequency="9.95" PeakHeight="468.724" Num="5" zHalfNm="360.758" Error="5.785">
-284.201 -44.678 32.174 -20.161 7.727
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.585" Depth="0.204"/>
<TopsideChapman PeakHeight="468.724" PeakDensity="1228318.9" PeakScaleHeight="77.177" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
