<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-01 -274 21:50:00.000"
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="8.0">
<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 22 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Moderate F-spread, F2x cusp not found, One of F2 cusps was derived from the other</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" >
2026.10.01 (274) 21:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.37" 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">
FF202627410012150009039031101000005008000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="7.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.837" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.267" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="7.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="440.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="440.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="85.000" Name="h`Es" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="7.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="358.027" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="307.733" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.624" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.100" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="73.530" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.258" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="37.695" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.620" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.960" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
440.000 445.000 450.000 450.000 450.000 450.000 455.000 462.060
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
15 0 30 0 0 36 0 24
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="20">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.1 1.15 1.2 1.25 1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
140.000 130.000 118.333 106.667 95.000 95.000 95.000 95.000 93.333 91.667 90.000 89.286 88.571 87.857 87.143 86.429 85.714 85.000 85.000 85.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
15 24 0 0 9 0 0 9 0 0 12 0 0 0 0 0 0 12 0 9
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="159">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.962 145.0 150.0 155.0 160.0 165.0 170.0 171.923 175.0 180.0 185.0 190.0 195.0 200.0 202.885 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 358.027 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.341 0.325 0.3 0.264 0.212 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.24 0.265 0.29 0.315 0.34 0.354 0.39 0.48 0.579 0.691 0.818 0.962 1.127 1.313 1.521 1.751 2.004 2.278 2.571 2.882 3.208 3.547 3.898 4.256 4.621 4.987 5.353 5.713 6.065 6.401 6.718 7.008 7.265 7.483 7.655 7.775 7.839 7.85 7.848 7.825 7.778 7.709 7.622 7.517 7.398 7.266 7.122 6.97 6.81 6.644 6.474 6.3 6.124 5.947 5.769 5.592 5.415 5.241 5.068 4.898 4.731 4.567 4.407 4.25 4.097 3.949 3.804 3.663 3.527 3.394 3.266 3.142 3.022 2.906 2.794 2.686 2.581 2.481 2.383 2.29 2.2 2.113 2.029 1.949 1.871 1.797 1.725 1.657 1.59 1.527 1.466 1.407 1.35 1.296 1.244 1.194 1.146 1.1 1.055 1.013 0.972 0.933 0.895 0.859 0.824 0.791 0.759 0.728 0.698 0.67 0.643 0.617 0.592 0.568 0.545 0.523 0.502 0.481 0.462 0.443 0.425 0.408 0.391 0.375 0.36 0.346 0.332 0.318 0.305 0.293 0.281 0.27 0.259 0.248 0.238 0.228 0.219 0.21 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="7.85" PeakHeight="358.027" Num="5" zHalfNm="307.733" Error="1.652">
-153.108 -4.33 2.883 -1.293 0.706
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="92.885" Depth="0.154"/>
<TopsideChapman PeakHeight="358.027" PeakDensity="764547.1" PeakScaleHeight="37.695" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
