<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-01 -032 23:00:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, 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" >
2026.02.01 (032) 23:00:00</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">
FF202603202012300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="5.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.887" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="15.878" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="0.750" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="5.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="421.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="396.319" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="360.163" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.444" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="55.777" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.695" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="27.002" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.050" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="61">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 347.500 345.000 345.000 345.000 345.000 347.500 350.000 365.000 370.000 385.000 394.000 403.000 412.000 421.000 430.000 440.000 430.000 420.000 475.000 472.500 470.000 465.000 462.500 460.000 452.500 445.000 440.000 435.000 430.000 425.000 420.000 415.000 410.000 405.000 405.000 407.000 409.000 411.000 413.000 415.000 415.000 416.250 417.500 418.750 420.000 421.250 422.500 423.750 425.000 426.250 427.500 428.750 430.000 425.000 423.333 421.667 433.541 450.264 475.563 518.316
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 54 0 0 60 0 57 0 60 63 60 0 0 0 51 51 0 51 51 0 51 54 0 51 0 51 0 48 0 0 0 0 51 54 57 0 0 0 0 57 57 0 0 0 0 0 0 48 0 0 0 0 48 48 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 0.390625 1.953125 -0.390625 -0.390625 -0.390625 2.734375 -1.171875 1.953125 1.953125 1.953125 2.734375 -1.953125 -1.953125 -0.390625 0.390625 1.171875 -0.390625 1.171875 2.734375 0.390625 1.171875 0.390625 0.390625 1.953125 1.171875 -1.171875 0.390625 -0.390625 2.734375 0.390625 -0.390625 -1.171875 -1.953125 -0.390625 0.390625 -1.171875 -1.171875 -0.390625 -1.953125 2.734375 2.734375 -1.171875 -0.390625 -0.390625 2.734375 -1.171875 -1.171875 -1.171875 -0.390625 2.734375 -2.734375 1.953125 -2.734375 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="132">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.354 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.708 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.062 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 396.319 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.308 0.278 0.237 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.238 0.261 0.284 0.308 0.331 0.354 0.354 0.396 0.453 0.524 0.609 0.702 0.798 0.896 0.995 1.093 1.193 1.293 1.395 1.499 1.604 1.712 1.822 1.936 2.053 2.173 2.298 2.427 2.561 2.7 2.845 2.997 3.156 3.323 3.499 3.685 3.882 4.092 4.316 4.556 4.81 5.076 5.33 5.491 5.5 5.49 5.448 5.377 5.281 5.164 5.03 4.882 4.725 4.56 4.39 4.217 4.043 3.87 3.698 3.53 3.364 3.203 3.047 2.896 2.75 2.61 2.476 2.347 2.224 2.106 1.994 1.887 1.785 1.689 1.597 1.51 1.427 1.349 1.274 1.204 1.138 1.074 1.015 0.958 0.905 0.855 0.807 0.762 0.719 0.679 0.641 0.605 0.571 0.539 0.509 0.481 0.454 0.428 0.404 0.382 0.36 0.34 0.321 0.303 0.286 0.27 0.255 0.24 0.227 0.214 0.202

</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="5.5" PeakHeight="396.319" Num="5" zHalfNm="360.163" Error="8.513">
-148.076 -60.138 29.173 -5.837 -1.379
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.062" Depth="0.154"/>
<TopsideChapman PeakHeight="396.319" PeakDensity="375310.2" PeakScaleHeight="27.002" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
