<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 09:00:00.000"
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="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" >
2026.02.21 (052) 09:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605202210900009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.225" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.348" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" Name="h`F2" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="5.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="341.799" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.966" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="287.075" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="231.996" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="4.294" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="78.616" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.074" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.750" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.190" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.910" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="69">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 250.000 250.000 250.500 251.000 251.500 252.000 252.500 253.000 253.500 254.000 254.500 255.000 255.500 256.000 256.500 257.000 257.500 258.000 258.500 259.000 259.500 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 275.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 302.500 305.000 310.000 315.000 315.000 320.000 322.878 326.291 330.403 335.451 341.799 350.020 361.090 376.799 400.833 442.201 530.228
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 60 0 54 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 57 57 0 60 63 51 0 63 60 0 69 75 75 0 72 57 63 66 69 63 66 66 60 66 60 66 69 66 69 69 0 63 69 66 66 66 69 66 66 63 63 69 63 69 0 51 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 1.171875 0.390625 -0.390625 -0.390625 -1.171875 -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 -1.953125 0.390625 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="151">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.308 95.0 100.0 105.0 110.0 115.0 120.0 125.0 127.754 130.0 135.0 140.0 145.0 145.508 150.0 155.0 160.0 163.262 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 287.075 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.643 0.837 0.935 0.966 0.95 0.9 0.81 0.739 0.739 0.739 0.739 0.739 0.739 0.796 0.86 0.924 0.966 1.017 1.178 1.353 1.535 1.725 1.923 2.133 2.356 2.597 2.858 3.141 3.448 3.774 4.109 4.439 4.748 5.024 5.261 5.461 5.624 5.755 5.856 5.929 5.976 5.998 6.0 5.997 5.981 5.95 5.906 5.851 5.785 5.709 5.626 5.535 5.437 5.335 5.228 5.117 5.003 4.887 4.769 4.65 4.53 4.41 4.291 4.172 4.054 3.937 3.821 3.707 3.595 3.485 3.377 3.271 3.167 3.066 2.967 2.871 2.777 2.685 2.596 2.51 2.425 2.344 2.264 2.187 2.113 2.04 1.97 1.902 1.836 1.773 1.711 1.651 1.594 1.538 1.484 1.432 1.382 1.333 1.286 1.241 1.197 1.154 1.114 1.074 1.036 0.999 0.964 0.929 0.896 0.864 0.834 0.804 0.775 0.748 0.721 0.695 0.67 0.646 0.623 0.601 0.579 0.559 0.539 0.519 0.501 0.483 0.466 0.449 0.433 0.417 0.402 0.388 0.374 0.361 0.348 0.335 0.323 0.312 0.301 0.29 0.279 0.269 0.26 0.25 0.241 0.233 0.224 0.216 0.209 0.201

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.966" PeakHeight="110.0" Num="3" Error="0.0">
-26.351 7.837 -1.178
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.966" EndFrequency="6.0" PeakHeight="287.075" Num="5" zHalfNm="231.996" Error="2.778">
-128.139 8.667 -7.768 4.642 -1.215
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="53.262" Depth="0.227"/>
<TopsideChapman PeakHeight="287.075" PeakDensity="446650.12" PeakScaleHeight="42.75" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
