<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-07 -038 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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2x 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" >
2026.02.07 (038) 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">
FF202603802072300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.891" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.670" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="380.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="380.000" 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="0.850" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="416.861" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="382.120" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="343.833" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.444" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="58.031" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.253" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.225" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="68.220" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.160" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="80">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
425.000 425.000 415.000 411.111 407.222 403.333 399.444 395.556 391.667 387.778 383.889 380.000 385.000 387.500 390.000 392.000 394.000 396.000 398.000 400.000 400.000 397.500 395.000 385.000 383.333 381.667 380.000 385.000 390.000 387.500 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 386.667 388.333 390.000 390.455 390.909 391.364 391.818 392.273 392.727 393.182 393.636 394.091 394.545 395.000 390.000 385.000 385.000 386.875 388.750 390.625 392.500 394.375 396.250 398.125 380.000 382.500 385.000 387.500 390.000 390.000 390.000 395.000 399.511 404.579 410.316 416.861 424.400 433.177 443.525 455.906 470.985 489.752
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 54 0 0 51 0 48 0 0 0 51 51 0 51 0 0 0 0 48 51 0 51 54 54 0 51 54 51 0 54 0 57 0 54 0 0 51 51 51 54 0 0 54 57 51 57 0 0 51 54 57 0 54 54 0 0 54 0 51 0 0 48 0 0 0 48 51 48 48 48 0 48 0 48 0 0 0 51 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 -2.734375 0.390625 1.171875 1.953125 1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -1.953125 0.390625 -0.390625 -1.171875 -0.390625 -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 1.171875 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 0.390625 -0.390625 -0.390625 0.390625 0.390625 -2.734375 2.734375 0.390625 1.171875 -1.171875 1.953125 -0.390625 -0.390625 -1.953125 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -1.171875 -0.390625 1.171875 0.390625 -0.390625 -0.390625 1.171875 0.390625 1.171875 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="139">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.395 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.791 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.186 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 382.12 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0
</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 0.307 0.33 0.353 0.354 0.398 0.465 0.567 0.701 0.846 0.988 1.128 1.266 1.404 1.544 1.686 1.832 1.983 2.138 2.301 2.47 2.648 2.835 3.032 3.241 3.462 3.697 3.949 4.217 4.503 4.809 5.133 5.475 5.827 6.181 6.517 6.81 7.026 7.139 7.15 7.143 7.102 7.027 6.923 6.793 6.643 6.475 6.294 6.103 5.904 5.699 5.491 5.283 5.074 4.868 4.664 4.463 4.268 4.077 3.892 3.712 3.539 3.372 3.211 3.056 2.907 2.765 2.629 2.499 2.374 2.255 2.142 2.034 1.931 1.833 1.74 1.651 1.567 1.487 1.41 1.338 1.269 1.204 1.142 1.083 1.027 0.974 0.923 0.876 0.83 0.787 0.746 0.708 0.671 0.636 0.603 0.572 0.542 0.514 0.487 0.462 0.438 0.415 0.394 0.373 0.354 0.335 0.318 0.301 0.286 0.271 0.257 0.243 0.231 0.219 0.207

</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="7.15" PeakHeight="382.12" Num="5" zHalfNm="343.833" Error="6.527">
-148.051 -38.26 19.029 -1.39 -3.262
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.186" Depth="0.154"/>
<TopsideChapman PeakHeight="382.12" PeakDensity="634274.2" PeakScaleHeight="29.225" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
