<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-12 -043 23:20:00.000"
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, 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" >
2026.02.12 (043) 23:20:00</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">
FF202604302122320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.983" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.860" 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="8.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="410.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="410.000" 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="7.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="410.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="410.446" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="393.946" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.259" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="28.746" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.371" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="12.710" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="63.320" 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="97">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
420.000 420.000 425.000 430.000 465.000 460.000 455.000 475.000 465.000 490.000 505.000 530.000 528.929 527.857 526.786 525.714 524.643 523.571 522.500 521.429 520.357 519.286 518.214 517.143 516.071 515.000 513.929 512.857 511.786 510.714 509.643 508.571 507.500 506.429 505.357 504.286 503.214 502.143 501.071 500.000 498.929 497.857 496.786 495.714 494.643 493.571 492.500 491.429 490.357 489.286 488.214 487.143 486.071 485.000 483.929 482.857 481.786 480.714 479.643 478.571 477.500 476.429 475.357 474.286 473.214 472.143 471.071 470.000 450.000 445.000 445.000 445.000 445.000 445.000 445.000 445.000 445.000 445.000 445.000 445.000 440.000 440.833 441.667 442.500 443.333 444.167 445.000 445.833 446.667 447.500 448.333 449.167 450.000 410.000 425.000 420.000 450.257
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54 0 54 57 0 54 54 57 54 57 51 0 0 0 0 0 0 0 0 0 54 0 51 0 0 0 0 0 0 0 0 0 0 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 48 54 0 51 48 0 51 0 0 0 57 54 54 0 0 0 0 0 0 54 54 51 48 54 0 48 54 51 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -1.171875 1.171875 -0.390625 -1.171875 -1.171875 -1.953125 -1.953125 -1.171875 -2.734375 1.953125 -1.171875 -2.734375 -1.171875 -1.953125 0.390625 2.734375 -1.171875 -1.171875 0.390625 0.390625 -1.953125 -2.734375 0.390625 -0.390625 -1.953125 -1.953125 2.734375 -0.390625 -1.171875 -1.953125 -1.953125 -2.734375 -1.953125 -2.734375 -1.171875 -2.734375 2.734375 -1.953125 -1.953125 -0.390625 -2.734375 1.953125 -1.953125 1.171875 -0.390625 -0.390625 1.953125 -2.734375 -2.734375 0.390625 -2.734375 -1.171875 1.953125 -0.390625 -1.171875 1.953125 2.734375 -2.734375 -1.171875 0.390625 1.171875 -1.171875 1.953125 1.953125 0.390625 1.171875 1.171875 1.171875 1.171875 0.390625 1.953125 1.171875 0.390625 1.953125 -0.390625 1.953125 1.171875 0.390625 -0.390625 -0.390625 -2.734375 -0.390625 1.953125 -2.734375 1.171875 1.953125 1.171875 1.953125 -0.390625 -0.390625 0.390625 0.390625 1.171875 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="103">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.253 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.505 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.758 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 410.446 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.33 0.31 0.283 0.245 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.207 0.229 0.252 0.274 0.297 0.319 0.342 0.354 0.459 0.56 0.643 0.72 0.795 0.87 0.945 1.022 1.1 1.181 1.264 1.349 1.438 1.529 1.624 1.723 1.826 1.934 2.046 2.163 2.286 2.415 2.55 2.692 2.842 3.001 3.168 3.346 3.535 3.737 3.953 4.187 4.439 4.715 5.018 5.357 5.743 6.196 6.765 7.678 8.0 7.907 7.629 7.222 6.736 6.211 5.674 5.147 4.643 4.171 3.733 3.333 2.97 2.641 2.347 2.083 1.847 1.637 1.45 1.284 1.137 1.006 0.89 0.788 0.697 0.616 0.545 0.482 0.426 0.377 0.334 0.295 0.261 0.231 0.204

</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="8.0" PeakHeight="410.446" Num="5" zHalfNm="393.946" Error="40.387">
-135.347 -100.197 37.856 0.0 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.758" Depth="0.154"/>
<TopsideChapman PeakHeight="410.446" PeakDensity="794044.7" PeakScaleHeight="12.71" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
