<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-09 -040 13:20:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 13:20:00</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">
FF202604002091320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.617" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.477" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="130.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.253" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.296" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="343.423" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="246.093" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.122" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="124.424" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.003" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.796" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="165.640" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.210" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="112">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 265.000 271.667 278.333 285.000 290.000 290.000 295.000 300.000 305.000 305.000 310.000 310.000 310.625 311.250 311.875 312.500 313.125 313.750 314.375 315.000 320.000 320.000 320.000 320.000 322.500 325.000 325.000 325.000 325.000 325.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 357.500 360.000 360.000 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 382.500 385.000 385.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 415.000 420.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 435.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 460.000 465.000 470.000 470.000 475.000 480.000 480.000 480.000 490.000 490.000 495.000 500.000 505.329 511.472 518.630 527.076 537.194 549.535 564.921
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 57 0 57 57 57 57 0 45 54 45 48 0 0 0 0 0 57 0 57 57 0 63 60 0 57 54 57 54 48 51 0 54 57 60 60 60 63 63 60 63 63 57 60 54 57 60 0 57 63 57 0 51 60 63 63 63 63 60 63 57 63 63 63 54 63 57 60 63 60 54 60 54 48 57 60 60 60 60 51 60 63 60 51 60 63 57 63 57 60 48 57 60 57 54 63 54 48 57 57 54 57 54 51 48 42 45 42 54 57 48
</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 -1.953125 1.953125 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 -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 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
140.000 140.000 135.000 135.000 135.000 132.500 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 45 0 51 0 60 57 48 51 57 57 57 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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
</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" >
89.504 90.0 95.0 100.0 105.0 110.0 112.119 114.238 115.0 116.357 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 343.423 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.188 2.815 3.147 3.253 3.131 3.131 3.175 3.253 3.377 3.532 3.679 3.821 3.961 4.101 4.242 4.385 4.53 4.678 4.828 4.982 5.139 5.299 5.462 5.628 5.796 5.967 6.14 6.315 6.491 6.669 6.847 7.026 7.206 7.385 7.565 7.745 7.925 8.104 8.284 8.463 8.642 8.82 8.999 9.176 9.353 9.528 9.701 9.87 10.032 10.183 10.317 10.423 10.487 10.5 10.499 10.491 10.473 10.445 10.408 10.363 10.31 10.25 10.182 10.108 10.028 9.942 9.851 9.755 9.655 9.551 9.443 9.332 9.218 9.101 8.982 8.861 8.738 8.614 8.488 8.362 8.235 8.107 7.979 7.85 7.722 7.593 7.465 7.338 7.211 7.085 6.959 6.834 6.711 6.588 6.466 6.346 6.227 6.109 5.993 5.878 5.764 5.652 5.542 5.433 5.325 5.219 5.115 5.012 4.911 4.812 4.714 4.618 4.523 4.43 4.339 4.249 4.16 4.074 3.989 3.905 3.823 3.743 3.664 3.587 3.511 3.436 3.363 3.291 3.221 3.152 3.085 3.019 2.954 2.89 2.828 2.767 2.708 2.649 2.592 2.536 2.481 2.427 2.374 2.323 2.272 2.223 2.174 2.127 2.081 2.035 1.991 1.947 1.905 1.863 1.822 1.782 1.743 1.705 1.668 1.631 1.595 1.56 1.526 1.492 1.46 1.428 1.396 1.365 1.335 1.306 1.277 1.249 1.222 1.195 1.168 1.143 1.117 1.093 1.069 1.045 1.022 1.0 0.977 0.956 0.935 0.914

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.253" PeakHeight="110.0" Num="3" Error="0.0">
-30.399 13.001 -3.098
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.253" EndFrequency="10.5" PeakHeight="343.423" Num="5" zHalfNm="246.093" Error="3.972">
-185.275 -56.702 17.747 -5.022 2.186
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.357" Depth="0.122"/>
<TopsideChapman PeakHeight="343.423" PeakDensity="1367866.0" PeakScaleHeight="69.796" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
