<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-20 -051 11:00:00.000"
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 0 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" >
2026.02.20 (051) 11:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202605102201100009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="8.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.771" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.720" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.700" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.550" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="107.931" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.826" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.603" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="385.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.642" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="328.217" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="210.061" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.990" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="159.802" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="31.185" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="88.222" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="172.310" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.960" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="80">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 260.000 255.000 255.000 255.000 260.000 262.083 264.167 266.250 268.333 270.417 272.500 274.583 276.667 278.750 280.833 282.917 285.000 285.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 301.667 303.333 305.000 310.000 312.500 315.000 315.000 320.000 321.250 322.500 323.750 325.000 327.500 330.000 335.000 335.000 335.000 340.000 340.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 370.000 375.000 380.000 385.000 385.000 390.000 395.000 405.000 410.000 415.000 425.000 430.000 440.000 450.000 460.000 470.000 475.000 490.000 505.000 515.000 530.000 545.000 570.000 600.000 650.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 48 54 0 60 60 0 57 0 0 0 0 0 0 0 0 0 66 57 66 66 66 66 63 63 66 66 60 0 0 63 66 0 0 66 63 0 48 0 69 60 69 60 66 72 66 72 66 60 69 63 69 66 66 66 60 60 60 60 66 66 63 66 66 63 63 63 63 66 66 63 63 66 66 60 60 57 57 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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>
<Trace Type="standard" Layer="E" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
107.931 109.058 110.408 112.104 114.421 118.222
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 66 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 1.953125 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="18">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 110.000 110.000 115.000 110.000 105.000 105.000 110.000 110.000 110.000 112.500 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 72 0 69 72 63 63 0 72 69 0 72 72 0 0 0 0 63
</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
</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" >
90.0 95.0 100.0 100.826 105.0 105.711 110.0 110.595 115.0 115.48 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 328.217 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.349 2.801 2.81 2.715 2.679 2.679 2.679 2.797 2.81 2.949 3.093 3.234 3.374 3.516 3.66 3.806 3.957 4.111 4.27 4.432 4.598 4.767 4.938 5.11 5.283 5.456 5.627 5.796 5.963 6.126 6.286 6.442 6.594 6.741 6.882 7.019 7.15 7.276 7.395 7.508 7.613 7.712 7.803 7.886 7.96 8.025 8.081 8.126 8.161 8.185 8.198 8.2 8.2 8.195 8.186 8.172 8.154 8.131 8.104 8.073 8.038 8.0 7.959 7.914 7.866 7.815 7.762 7.705 7.647 7.586 7.524 7.459 7.393 7.325 7.255 7.184 7.112 7.038 6.964 6.889 6.813 6.736 6.658 6.581 6.502 6.423 6.344 6.265 6.186 6.107 6.027 5.948 5.869 5.79 5.711 5.633 5.555 5.477 5.4 5.323 5.246 5.17 5.095 5.02 4.946 4.872 4.8 4.727 4.656 4.585 4.515 4.445 4.376 4.308 4.241 4.175 4.109 4.044 3.98 3.916 3.854 3.792 3.731 3.671 3.611 3.553 3.495 3.438 3.382 3.326 3.271 3.217 3.164 3.112 3.06 3.009 2.959 2.91 2.861 2.813 2.766 2.719 2.674 2.629 2.584 2.541 2.498 2.455 2.414 2.373 2.332 2.292 2.253 2.215 2.177 2.14 2.103 2.067 2.032 1.997 1.963 1.929 1.896 1.863 1.831 1.799 1.768 1.738 1.708 1.678 1.649 1.621 1.593 1.565 1.538 1.511 1.485 1.459 1.434 1.409 1.385 1.361 1.337 1.314 1.291 1.268 1.246

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="100.826" Num="3" Error="2.698">
-15.919 6.605 -1.512
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.81" EndFrequency="8.2" PeakHeight="328.217" Num="5" zHalfNm="210.061" Error="4.169">
-207.781 -6.374 1.576 -1.28 1.122
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.654" Depth="0.131"/>
<TopsideChapman PeakHeight="328.217" PeakDensity="834243.2" PeakScaleHeight="88.222" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
