<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-19 -050 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" >
2026.02.19 (050) 23:00:00</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">
FF202605002192300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.987" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.988" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="405.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="405.000" 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="8.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="411.650" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="388.547" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="368.153" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.445" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="34.921" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="7.221" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="14.989" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="61.620" 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="96">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
475.000 472.000 469.000 466.000 463.000 460.000 470.000 465.000 450.000 445.000 445.000 443.500 442.000 440.500 439.000 437.500 436.000 434.500 433.000 431.500 430.000 425.000 426.250 427.500 428.750 430.000 430.000 431.667 433.333 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 430.000 425.000 420.000 415.000 410.000 405.000 405.000 405.000 405.000 405.000 407.500 410.000 415.000 405.000 410.000 412.500 415.000 417.500 420.000 422.500 425.000 427.500 430.000 428.333 426.667 425.000 426.818 428.636 430.455 432.273 434.091 435.909 437.727 439.545 441.364 443.182 445.000 435.000 425.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.000 405.406 405.898 406.505 407.275 408.283 409.659 411.650 414.785 420.452 433.792
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 0 51 51 54 51 57 54 54 51 0 0 48 57 57 0 54 51 51 0 0 0 51 51 57 0 48 0 54 54 0 54 51 0 0 54 0 0 0 54 0 57 54 51 0 51 0 54 57 57 51 0 51 51 48 0 48 0 48 0 0 51 0 0 0 0 0 0 0 0 0 0 48 0 48 51 0 48 54 0 0 54 54 51 51 0 48 48 0 0 48 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 2.734375 -2.734375 1.953125 -0.390625 -0.390625 1.171875 2.734375 0.390625 -0.390625 2.734375 0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 1.171875 -0.390625 -1.171875 0.390625 -1.171875 -2.734375 -1.171875 -0.390625 -1.171875 -0.390625 -2.734375 -2.734375 -1.171875 -1.953125 0.390625 0.390625 0.390625 -1.171875 2.734375 1.953125 -2.734375 -0.390625 -2.734375 -0.390625 -1.171875 1.171875 -1.171875 -1.171875 -1.953125 -2.734375 -0.390625 -2.734375 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 0.390625 -1.171875 -1.171875 -0.390625 -1.953125 0.390625 2.734375 0.390625 -2.734375 -1.171875 -2.734375 2.734375 -0.390625 2.734375 1.953125 -1.953125 1.953125 2.734375 1.953125 -1.171875 1.171875 1.953125 -0.390625 -1.953125 1.953125 0.390625 -2.734375 -1.953125 1.953125 -2.734375 1.171875 -1.953125 0.390625 1.953125 -1.171875 -1.953125 1.953125 0.390625 -2.734375 -1.171875 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="105">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.536 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.071 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.607 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 388.547 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0
</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 0.279 0.239 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.213 0.236 0.259 0.282 0.305 0.328 0.351 0.354 0.424 0.53 0.657 0.793 0.931 1.069 1.208 1.347 1.487 1.629 1.773 1.919 2.069 2.222 2.379 2.54 2.706 2.877 3.053 3.236 3.426 3.623 3.829 4.043 4.268 4.504 4.753 5.017 5.298 5.601 5.929 6.29 6.695 7.169 7.773 8.7 8.692 8.557 8.285 7.913 7.476 7.0 6.507 6.013 5.531 5.067 4.628 4.216 3.833 3.478 3.153 2.854 2.582 2.333 2.108 1.903 1.718 1.55 1.398 1.261 1.137 1.025 0.924 0.833 0.75 0.676 0.609 0.549 0.495 0.446 0.402 0.362 0.326 0.294 0.265 0.239 0.215

</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="8.7" PeakHeight="388.547" Num="5" zHalfNm="368.153" Error="18.807">
-131.047 -80.916 44.536 -10.513 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.607" Depth="0.154"/>
<TopsideChapman PeakHeight="388.547" PeakDensity="939081.9" PeakScaleHeight="14.989" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
