<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-10 -283 20:40:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.10.10 (283) 20:40:00</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">
FF202628310102040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.142" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="39.275" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" 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="12.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="382.118" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.263" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="300.623" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="259.318" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="10.314" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="60.745" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.405" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="30.259" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="73.770" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.150" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="137">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 282.500 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.658 296.316 296.974 297.632 298.289 298.947 299.605 300.263 300.921 301.579 302.237 302.895 303.553 304.211 304.868 305.526 306.184 306.842 307.500 308.158 308.816 309.474 310.132 310.789 311.447 312.105 312.763 313.421 314.079 314.737 315.395 316.053 316.711 317.368 318.026 318.684 319.342 320.000 320.658 321.316 321.974 322.632 323.289 323.947 324.605 325.263 325.921 326.579 327.237 327.895 328.553 329.211 329.868 330.526 331.184 331.842 332.500 333.158 333.816 334.474 335.132 335.789 336.447 337.105 337.763 338.421 339.079 339.737 340.395 341.053 341.711 342.368 343.026 343.684 344.342 345.000 350.000 352.500 355.000 355.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 370.000 371.667 373.333 375.000 375.000 375.000 375.000 376.968 379.303 382.118 385.578 389.935 395.587
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 78 78 78 78 78 78 78 0 75 75 78 78 78 78 78 78 78 78 78 78 78 81 66 0 0 72 75 75 78 78 0 0 0 0 0 0 60 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 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 0 0 0 0 69 0 66 63 0 54 57 0 66 66 66 69 66 69 69 60 63 0 69 66 63 0 0 60 66 69 69 69 69 69 63 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="136">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.06 95.0 100.0 105.0 110.0 115.0 120.0 123.228 125.0 130.0 135.0 136.456 140.0 145.0 149.684 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 300.623 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.843 1.094 1.223 1.263 1.241 1.173 1.102 1.102 1.102 1.102 1.102 1.145 1.206 1.263 1.276 1.504 1.764 2.047 2.345 2.653 2.968 3.287 3.612 3.941 4.274 4.613 4.958 5.31 5.669 6.035 6.411 6.796 7.192 7.599 8.019 8.452 8.901 9.366 9.847 10.345 10.858 11.376 11.876 12.294 12.497 12.5 12.475 12.39 12.252 12.068 11.843 11.586 11.301 10.994 10.671 10.334 9.989 9.639 9.287 8.935 8.585 8.239 7.9 7.567 7.242 6.926 6.619 6.321 6.034 5.757 5.49 5.233 4.987 4.75 4.524 4.307 4.099 3.901 3.711 3.53 3.358 3.193 3.036 2.886 2.744 2.608 2.479 2.356 2.238 2.127 2.021 1.92 1.824 1.733 1.647 1.564 1.486 1.412 1.341 1.274 1.21 1.149 1.091 1.037 0.985 0.935 0.888 0.843 0.801 0.761 0.723 0.686 0.652 0.619 0.588 0.558 0.53 0.504 0.478 0.454 0.431 0.41 0.389 0.369 0.351 0.333 0.316 0.301 0.285 0.271 0.257 0.244 0.232 0.22 0.209

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.263" PeakHeight="110.0" Num="3" Error="0.0">
-27.486 9.108 -1.562
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.263" EndFrequency="12.5" PeakHeight="300.623" Num="5" zHalfNm="259.318" Error="0.878">
-128.303 -38.469 20.726 -5.246 0.353
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="39.684" Depth="0.161"/>
<TopsideChapman PeakHeight="300.623" PeakDensity="1938585.6" PeakScaleHeight="30.259" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
