<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-10 -283 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, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.10.10 (283) 23:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.38" 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">
FF202628310102320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.779" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.879" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="365.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="365.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="406.937" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="366.969" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.788" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="62.070" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.126" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.479" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.680" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.230" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="117">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
365.000 370.000 370.000 372.500 375.000 445.000 450.000 440.000 435.000 430.000 425.000 420.000 415.000 410.000 405.000 400.000 400.000 400.000 400.000 390.000 385.000 385.000 380.000 380.000 380.000 385.000 380.000 380.000 380.000 380.000 380.000 380.000 377.500 375.000 375.000 380.000 380.000 381.667 383.333 385.000 387.500 390.000 395.000 396.271 397.542 398.814 400.085 401.356 402.627 403.898 405.169 406.441 407.712 408.983 410.254 411.525 412.797 414.068 415.339 416.610 417.881 419.153 420.424 421.695 422.966 424.237 425.508 426.780 428.051 429.322 430.593 431.864 433.136 434.407 435.678 436.949 438.220 439.492 440.763 442.034 443.305 444.576 445.847 447.119 448.390 449.661 450.932 452.203 453.475 454.746 456.017 457.288 458.559 459.831 461.102 462.373 463.644 464.915 466.186 467.458 468.729 470.000 470.000 472.500 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 0 0 72 75 57 75 69 75 0 63 66 72 72 72 75 75 69 63 81 78 66 0 81 75 72 72 72 75 63 0 69 72 75 75 75 0 72 66 0 0 78 0 0 0 0 78 0 0 0 78 0 63 0 0 0 0 57 0 0 0 0 0 0 0 0 0 0 57 0 0 0 0 0 0 0 66 0 0 0 0 0 0 0 0 57 0 0 0 0 0 0 0 0 0 63 66 0 0 54 72 66 0 66 0 57 66 66 66 0 60 63 63 60 66 0
</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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 1.171875 1.171875 0.390625 2.734375 0.390625 1.171875 0.390625 0.390625 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 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 1.953125 1.953125 1.171875 -1.953125 -1.953125 1.953125 1.953125 1.953125 -1.171875 2.734375 2.734375 -1.171875 -1.953125 -1.953125 -1.953125 2.734375 2.734375 2.734375 2.734375 2.734375 -1.953125 -1.953125 2.734375 -1.171875 -1.171875 -1.953125 -1.953125 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="152">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.27 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.539 185.0 190.0 195.0 200.0 205.0 210.0 215.0 215.809 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 406.937 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.332 0.313 0.287 0.252 0.203 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.219 0.241 0.263 0.285 0.307 0.329 0.35 0.354 0.419 0.511 0.623 0.755 0.905 1.071 1.251 1.44 1.638 1.843 2.054 2.271 2.494 2.723 2.957 3.198 3.445 3.699 3.959 4.227 4.503 4.788 5.081 5.384 5.697 6.021 6.358 6.707 7.07 7.448 7.843 8.255 8.685 9.132 9.592 10.051 10.465 10.725 10.75 10.739 10.676 10.563 10.407 10.214 9.99 9.741 9.472 9.187 8.89 8.585 8.276 7.965 7.654 7.346 7.042 6.743 6.45 6.165 5.888 5.619 5.359 5.108 4.867 4.635 4.412 4.198 3.993 3.797 3.61 3.431 3.26 3.097 2.942 2.794 2.653 2.519 2.392 2.27 2.155 2.045 1.941 1.842 1.748 1.658 1.573 1.493 1.416 1.344 1.275 1.209 1.147 1.088 1.032 0.979 0.929 0.881 0.835 0.792 0.751 0.713 0.676 0.641 0.608 0.577 0.547 0.519 0.492 0.467 0.443 0.42 0.398 0.378 0.358 0.34 0.322 0.305 0.29 0.275 0.261 0.247 0.234 0.222 0.211

</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="10.75" PeakHeight="406.937" Num="5" zHalfNm="366.969" Error="4.06">
-166.317 -47.367 32.415 -11.505 1.646
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="105.809" Depth="0.154"/>
<TopsideChapman PeakHeight="406.937" PeakDensity="1433777.9" PeakScaleHeight="29.479" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
