<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 02:20:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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" >
2026.02.22 (053) 02:20:00</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">
FF202605302220220009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.382" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.520" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="332.383" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" 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="274.400" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="243.752" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.410" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="43.773" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.247" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="23.117" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="37.380" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.670" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="85">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 251.667 248.333 245.000 242.500 240.000 240.000 240.000 245.000 242.500 240.000 240.000 240.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 247.500 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 256.429 257.857 259.286 260.714 262.143 263.571 265.000 266.429 267.857 269.286 270.714 272.143 273.571 275.000 275.000 276.667 278.333 280.000 281.667 283.333 285.000 287.500 290.000 292.727 295.455 298.182 300.909 295.000 305.000 310.000 315.000 320.000 325.000 330.000 330.525 331.264 332.383 334.277 338.176 350.841
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 66 57 0 0 66 0 63 69 72 0 69 69 66 66 72 0 0 69 0 60 69 0 63 69 63 75 72 75 0 0 75 72 0 0 63 66 0 72 69 66 72 75 0 0 0 75 75 0 0 72 66 72 66 0 0 63 72 72 69 0 0 66 69 0 66 0 60 0 0 0 66 66 63 63 60 66 63 63 0 0 60 60 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 1.171875 1.171875 0.390625 -1.171875 1.171875 -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 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 -1.171875 -1.171875 1.171875 1.171875 -1.171875 1.171875 -1.171875 1.953125 1.171875 0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 1.953125 0.390625 -1.171875 -1.171875 -1.953125 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="102">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.333 145.0 150.0 155.0 160.0 165.0 170.0 170.667 175.0 180.0 185.0 190.0 195.0 200.0 201.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 274.4 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.341 0.323 0.297 0.26 0.205 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.247 0.273 0.298 0.324 0.349 0.354 0.498 0.694 0.951 1.324 1.891 2.706 3.651 4.542 5.304 5.928 6.424 6.799 7.059 7.208 7.25 7.25 7.211 7.116 6.974 6.794 6.584 6.352 6.103 5.844 5.578 5.31 5.044 4.781 4.524 4.274 4.032 3.799 3.577 3.364 3.161 2.969 2.786 2.614 2.451 2.297 2.152 2.016 1.887 1.767 1.654 1.547 1.448 1.355 1.267 1.185 1.108 1.036 0.969 0.906 0.847 0.792 0.741 0.692 0.647 0.605 0.566 0.529 0.494 0.462 0.432 0.404 0.377 0.353 0.33 0.308 0.288 0.269 0.252 0.235 0.22 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="7.25" PeakHeight="274.4" Num="5" zHalfNm="243.752" Error="1.916">
-80.442 11.966 -7.004 1.73 0.35
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="91.0" Depth="0.154"/>
<TopsideChapman PeakHeight="274.4" PeakDensity="652140.2" PeakScaleHeight="23.117" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
