<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-07 -038 20:40:00.000"
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" >
2026.02.07 (038) 20:40:00</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">
FF202603802072040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.569" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.795" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.200" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" 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="1.812" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="381.891" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="286.132" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.322" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.100" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="135.180" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.822" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.984" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="141.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.820" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.300" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="167">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 271.154 272.308 273.462 274.615 275.769 276.923 278.077 279.231 280.385 281.538 282.692 283.846 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 297.500 300.000 300.000 300.000 300.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 311.250 312.500 313.750 315.000 315.000 316.667 318.333 320.000 320.000 320.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 340.000 342.500 345.000 345.000 345.000 345.000 345.000 347.500 350.000 350.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 365.000 365.000 365.000 367.500 370.000 370.000 372.500 375.000 375.000 380.000 380.000 380.000 382.500 385.000 387.500 390.000 390.000 390.000 390.000 390.000 390.000 400.000 400.000 400.000 400.000 400.000 402.500 405.000 407.500 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 428.333 431.667 435.000 440.000 440.000 440.000 442.500 445.000 450.000 450.000 455.000 455.000 460.000 465.000 465.000 470.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 505.000 510.000 515.000 523.333 531.667 540.000 545.000 555.000 565.000 580.000 595.000 620.000 645.137
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 57 63 63 72 69 69 0 0 0 0 0 0 0 51 0 0 0 0 72 72 0 0 72 69 69 78 0 72 72 69 66 0 0 0 69 66 54 69 0 0 57 60 57 60 51 66 63 0 66 0 60 0 66 0 0 0 63 66 0 66 66 72 75 63 72 72 75 78 69 72 51 0 66 0 57 63 72 69 0 0 69 72 63 69 54 63 69 75 75 72 75 78 66 72 69 0 72 72 63 63 69 57 66 54 57 66 69 72 63 69 57 63 66 69 66 0 66 0 63 66 57 63 66 63 63 69 60 66 0 0 0 60 48 54 57 0 54 48 51 51 54 54 45 51 48 45 48 48 51 0 48 48 48 48 45 45 0 45 45 48 48 45 45 45 42
</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="83">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 120.000 116.667 113.333 110.000 110.000 110.000 110.000 111.667 113.333 115.000 115.000 113.333 111.667 110.000 115.000 117.500 120.000 120.000 120.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 125.000 125.000 123.750 122.500 121.250 120.000 125.000 125.000 122.500 120.000 120.000 125.000 123.750 122.500 121.250 120.000 125.000 120.000 115.000 116.667 118.333 120.000 120.000 120.000 125.000 123.333 121.667 120.000 125.000 123.333 121.667 120.000 120.000 120.000 120.000 120.000 121.250 122.500 123.750 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 0 69 51 57 66 0 0 69 69 0 0 63 0 0 54 63 63 57 75 63 0 0 72 0 69 69 69 0 0 69 0 60 69 63 0 0 0 63 72 57 51 54 0 54 48 66 57 54 0 60 63 54 0 0 0 0 57 0 60 0 0 57 0 0 0 0 0 60 57 0 0 54 57 60 0 54 0 0 0 57
</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="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.819 90.0 95.0 100.0 105.0 110.0 115.0 119.279 120.0 125.0 128.557 130.0 135.0 137.836 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 381.891 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.216 1.213 1.569 1.754 1.812 1.773 1.675 1.675 1.675 1.675 1.696 1.77 1.812 1.876 2.016 2.152 2.287 2.425 2.567 2.714 2.868 3.029 3.199 3.377 3.566 3.765 3.974 4.193 4.423 4.662 4.909 5.164 5.426 5.692 5.963 6.235 6.51 6.785 7.06 7.333 7.605 7.875 8.142 8.406 8.667 8.923 9.174 9.42 9.659 9.892 10.117 10.332 10.537 10.73 10.908 11.071 11.216 11.341 11.444 11.522 11.573 11.598 11.6 11.598 11.586 11.563 11.53 11.488 11.437 11.378 11.311 11.236 11.155 11.067 10.973 10.873 10.769 10.66 10.546 10.429 10.308 10.184 10.057 9.928 9.797 9.664 9.529 9.392 9.255 9.117 8.978 8.839 8.699 8.56 8.421 8.281 8.143 8.005 7.867 7.73 7.595 7.46 7.326 7.194 7.063 6.933 6.804 6.677 6.551 6.427 6.305 6.184 6.065 5.947 5.831 5.717 5.604 5.493 5.384 5.277 5.171 5.067 4.965 4.864 4.766 4.668 4.573 4.479 4.387 4.297 4.208 4.121 4.036 3.952 3.869 3.789 3.709 3.632 3.556 3.481 3.408 3.336 3.265 3.196 3.129 3.062 2.997 2.934 2.871 2.81 2.75 2.692 2.634 2.578 2.523 2.469 2.416 2.364 2.313 2.264 2.215 2.168 2.121 2.075 2.031 1.987 1.944 1.902 1.861 1.821 1.782 1.743 1.706 1.669 1.633 1.598 1.563 1.529 1.496 1.464 1.432 1.401 1.371 1.341 1.312 1.284 1.256

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.812" PeakHeight="110.0" Num="3" Error="0.0">
-28.755 10.702 -2.128
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.812" EndFrequency="11.6" PeakHeight="381.891" Num="5" zHalfNm="286.132" Error="4.107">
-227.877 -20.405 5.601 -3.654 2.28
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="27.836" Depth="0.137"/>
<TopsideChapman PeakHeight="381.891" PeakDensity="1669478.9" PeakScaleHeight="70.984" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
