<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-10 -041 19:40:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o 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) 19:40:00</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">
FF202604102101940009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.454" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.770" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.100" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.500" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.560" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" 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="24" Val="115.251" 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="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="515.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.496" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="382.617" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="271.538" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.535" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.900" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="148.755" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.168" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="79.197" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="175.580" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="129">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 260.000 265.000 268.000 271.000 274.000 277.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 286.429 287.857 289.286 290.714 292.143 293.571 295.000 295.000 300.000 305.000 300.000 303.333 306.667 310.000 310.000 310.000 310.000 315.000 320.000 320.000 320.000 325.000 325.000 327.500 330.000 330.000 335.000 335.000 335.000 335.000 335.000 337.500 340.000 345.000 350.000 345.000 347.500 350.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 495.000 500.000 505.000 505.000 510.000 515.000 515.000 520.000 525.000 530.000 535.000 540.000 545.000 550.000 560.000 565.000 573.753 583.738 595.236 608.617 624.387 643.246
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 60 0 0 0 0 0 57 0 63 57 0 63 0 0 0 0 0 0 63 57 0 63 0 54 0 63 66 66 63 0 60 66 66 63 66 0 66 66 60 0 66 60 66 0 66 0 54 66 0 66 45 57 63 69 60 66 69 66 54 63 69 63 66 57 66 57 66 57 66 60 69 60 69 63 69 63 69 66 57 69 63 69 66 66 66 66 66 60 66 63 57 66 57 66 57 63 57 63 60 60 60 60 57 60 60 60 60 57 63 0 57 60 60 60 57 57 54 54 54 51 51 51 45 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 -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 -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 1.953125 -1.171875 -1.953125 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.251 120.367
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48
</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="24">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 122.500 120.000 120.000 120.000 117.500 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 60 57 60 57 60 60 63 66 66 66 66 66 0 66 0 66 0 0 0 63 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 -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" >
89.627 90.0 95.0 100.0 105.0 110.0 115.0 115.602 120.0 121.205 125.0 126.807 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 382.617 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.231 1.719 2.216 2.477 2.56 2.458 2.432 2.432 2.432 2.519 2.56 2.644 2.774 2.905 3.038 3.174 3.315 3.461 3.613 3.77 3.933 4.101 4.275 4.453 4.635 4.82 5.007 5.195 5.384 5.572 5.759 5.946 6.13 6.313 6.494 6.673 6.851 7.026 7.2 7.372 7.542 7.711 7.879 8.045 8.21 8.374 8.537 8.698 8.859 9.018 9.176 9.332 9.486 9.638 9.786 9.928 10.064 10.189 10.3 10.393 10.459 10.495 10.5 10.499 10.491 10.476 10.453 10.423 10.386 10.343 10.294 10.24 10.18 10.115 10.045 9.97 9.892 9.809 9.723 9.634 9.542 9.447 9.349 9.249 9.147 9.043 8.937 8.83 8.721 8.612 8.501 8.39 8.278 8.165 8.052 7.939 7.826 7.713 7.6 7.487 7.375 7.262 7.151 7.04 6.929 6.82 6.711 6.602 6.495 6.389 6.283 6.179 6.075 5.973 5.872 5.772 5.673 5.575 5.479 5.383 5.289 5.196 5.104 5.014 4.925 4.837 4.75 4.665 4.581 4.498 4.416 4.336 4.256 4.178 4.102 4.026 3.952 3.879 3.807 3.736 3.667 3.598 3.531 3.465 3.4 3.336 3.274 3.212 3.151 3.092 3.033 2.976 2.92 2.864 2.81 2.756 2.704 2.652 2.602 2.552 2.503 2.455 2.408 2.362 2.317 2.272 2.229 2.186 2.144 2.103 2.062 2.022 1.983 1.945 1.908 1.871 1.835 1.799 1.764 1.73 1.697 1.664 1.632 1.6 1.569 1.539 1.509

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.56" PeakHeight="110.0" Num="3" Error="0.0">
-29.779 12.102 -2.696
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.56" EndFrequency="10.5" PeakHeight="382.617" Num="5" zHalfNm="271.538" Error="3.385">
-224.953 -45.733 22.335 -10.231 2.772
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.807" Depth="0.128"/>
<TopsideChapman PeakHeight="382.617" PeakDensity="1367866.0" PeakScaleHeight="79.197" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
