<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-26 -026 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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% 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</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" >
2026.01.26 (026) 23:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602601262320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.877" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.746" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.300" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="446.667" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="401.964" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="379.851" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.077" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="36.191" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.349" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="17.259" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="61.750" 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="123">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 8.75 8.8 8.85 8.9 8.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
455.000 445.000 440.000 450.000 445.000 437.500 430.000 425.000 425.000 422.500 420.000 417.500 415.000 413.000 411.000 409.000 407.000 405.000 403.000 401.000 399.000 397.000 395.000 393.000 391.000 389.000 387.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 381.250 382.500 383.750 385.000 390.000 400.000 408.333 416.667 425.000 425.000 426.429 427.857 429.286 430.714 432.143 433.571 435.000 436.429 437.857 439.286 440.714 442.143 443.571 445.000 445.000 445.000 446.667 448.333 450.000 451.667 453.333 455.000 456.667 458.333 460.000 450.000 440.000 435.000 445.000 442.500 440.000 437.500 435.000 430.000 420.000 420.000 420.000 420.000 415.000 420.000 420.000 425.000 425.000 425.000 420.000 420.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.556 426.111 426.667 427.222 427.778 428.333 428.889 429.444 430.000 431.667 433.333 435.000 440.000 441.173 443.071 446.667 456.080
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 60 54 60 0 60 66 66 0 63 0 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 63 0 66 63 63 66 0 63 54 63 0 0 60 0 57 54 0 0 0 0 57 54 0 0 54 60 60 0 0 0 0 0 0 54 0 57 0 0 0 57 51 54 0 0 54 54 0 0 51 48 54 60 54 63 54 57 57 0 60 57 72 0 0 69 66 75 75 66 0 63 78 78 66 81 0 78 69 75 75 0 0 69 69 0 72 75 69 63 63 72 63 66 66 69 66 66
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 1.171875 1.953125 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -1.953125 -0.390625 -0.390625 -0.390625 0.390625 -1.953125 -0.390625 -1.953125 -0.390625 2.734375 1.953125 -1.171875 1.171875 1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 2.734375 1.171875 -0.390625 -0.390625 -0.390625 0.390625 1.953125 1.953125 -0.390625 2.734375 2.734375 1.953125 2.734375 -0.390625 -2.734375 2.734375 -2.734375 -1.171875 -0.390625 0.390625 2.734375 1.953125 0.390625 -0.390625 0.390625 -0.390625 1.953125 1.953125 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -1.171875 2.734375 1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="114">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.138 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.275 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.413 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 401.964 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0
</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 0.282 0.244 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.23 0.253 0.275 0.298 0.321 0.343 0.354 0.392 0.489 0.603 0.718 0.829 0.938 1.045 1.152 1.26 1.369 1.48 1.594 1.711 1.831 1.956 2.085 2.219 2.359 2.505 2.659 2.82 2.989 3.168 3.358 3.56 3.776 4.006 4.255 4.524 4.817 5.139 5.495 5.892 6.343 6.861 7.466 8.171 8.853 8.95 8.924 8.779 8.531 8.206 7.826 7.41 6.975 6.533 6.093 5.664 5.249 4.853 4.479 4.126 3.795 3.487 3.201 2.936 2.691 2.465 2.257 2.066 1.89 1.729 1.581 1.446 1.322 1.208 1.104 1.009 0.922 0.842 0.77 0.703 0.643 0.587 0.536 0.49 0.448 0.409 0.373 0.341 0.312 0.285 0.26 0.238 0.217

</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="8.95" PeakHeight="401.964" Num="5" zHalfNm="379.851" Error="7.527">
-140.114 -78.963 32.157 0.555 -3.186
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.413" Depth="0.154"/>
<TopsideChapman PeakHeight="401.964" PeakDensity="993827.56" PeakScaleHeight="17.259" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
