<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-09 -040 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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.02.09 (040) 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">
FF202604002092040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="10.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.342" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.124" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.550" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="1.610" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="95.009" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="585.931" 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="1.813" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="414.458" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="307.649" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.322" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.950" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="148.719" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.932" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="74.472" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="169.720" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.450" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.400" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 270.000 273.750 277.500 281.250 285.000 285.000 285.000 285.000 285.000 286.667 288.333 290.000 291.667 293.333 295.000 295.000 297.000 299.000 301.000 303.000 305.000 307.000 309.000 311.000 313.000 315.000 310.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 325.000 330.000 330.000 330.000 332.500 335.000 337.500 340.000 342.500 345.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 367.500 370.000 370.000 375.000 375.000 377.500 380.000 380.000 385.000 385.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 418.750 422.500 426.250 430.000 435.000 440.000 440.000 440.000 445.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 490.000 495.000 500.000 500.000 505.000 510.000 510.000 515.000 517.500 520.000 525.000 525.000 525.000 530.000 535.000 535.000 540.000 540.000 545.000 550.000 555.000 557.500 560.000 560.000 565.000 570.000 575.000 580.000 580.000 582.500 585.931 589.813 594.240 599.334 605.261 612.242 620.586 630.734 643.344
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 0 0 0 0 0 0 60 57 0 0 0 0 0 66 66 0 0 66 0 0 0 0 0 0 57 69 69 66 60 51 72 63 0 0 60 0 72 0 66 57 63 0 63 69 69 69 69 72 69 72 66 69 69 66 0 66 69 60 66 0 69 72 69 72 66 60 66 66 66 66 66 63 66 63 66 0 63 0 66 63 60 69 69 66 66 63 63 69 69 66 63 72 66 72 66 69 66 63 63 54 66 69 69 60 66 63 0 63 54 63 69 66 60 69 63 66 63 57 48 0 57 63 0 57 0 51 60 0 60 60 57 51 0 45 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 -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 -1.171875 -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 -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 -1.171875 -1.953125 -1.171875 -0.390625 -1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -1.953125 -1.171875 2.734375 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.55 1.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.009 96.972
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 115.000 115.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 60 63 63 66 60 0 63 0 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 -0.390625 -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="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.89 90.0 95.0 100.0 105.0 110.0 115.0 119.274 120.0 125.0 128.549 130.0 135.0 137.823 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 414.458 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.21 1.077 1.395 1.558 1.61 1.576 1.489 1.489 1.489 1.489 1.508 1.573 1.61 1.66 1.77 1.876 1.983 2.093 2.208 2.331 2.461 2.602 2.753 2.917 3.093 3.281 3.479 3.685 3.896 4.109 4.321 4.53 4.736 4.936 5.132 5.324 5.51 5.693 5.871 6.046 6.218 6.387 6.554 6.718 6.88 7.04 7.199 7.357 7.514 7.67 7.825 7.98 8.135 8.289 8.443 8.598 8.753 8.908 9.063 9.219 9.374 9.528 9.681 9.83 9.972 10.101 10.207 10.278 10.3 10.3 10.295 10.28 10.258 10.228 10.19 10.146 10.094 10.036 9.973 9.904 9.829 9.75 9.666 9.579 9.487 9.392 9.293 9.192 9.088 8.982 8.873 8.763 8.651 8.538 8.423 8.308 8.191 8.074 7.957 7.839 7.721 7.603 7.485 7.367 7.25 7.133 7.016 6.9 6.785 6.671 6.557 6.445 6.333 6.222 6.113 6.005 5.897 5.791 5.687 5.583 5.481 5.38 5.281 5.182 5.086 4.99 4.896 4.803 4.712 4.622 4.534 4.447 4.361 4.277 4.194 4.112 4.032 3.953 3.875 3.799 3.724 3.651 3.579 3.508 3.438 3.37 3.302 3.236 3.172 3.108 3.046 2.985 2.925 2.866 2.808 2.751 2.696 2.641 2.587 2.535 2.483 2.433 2.384 2.335 2.287 2.241 2.195 2.15 2.106 2.063 2.021 1.98 1.939 1.899 1.86 1.822 1.785 1.748 1.712 1.677 1.643 1.609 1.576 1.543 1.511 1.48 1.45

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.61" PeakHeight="110.0" Num="3" Error="0.0">
-28.368 10.197 -1.939
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.61" EndFrequency="10.3" PeakHeight="414.458" Num="5" zHalfNm="307.649" Error="5.008">
-246.538 -51.577 36.279 -21.39 6.591
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="27.823" Depth="0.121"/>
<TopsideChapman PeakHeight="414.458" PeakDensity="1316253.1" PeakScaleHeight="74.472" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
