<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-21 -294 20:30:00.000"
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="12.0">
<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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: F2o cusp not found, Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, F2O model cusp does not fit trace</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" >
2026.10.21 (294) 20:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.39" 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">
FF202629410212030009039031101000005012000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.501" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.386" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="300.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="300.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="129.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="502.444" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="1.444" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="389.958" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="290.886" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="10.373" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="140.721" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.270" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="73.369" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="146.040" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.860" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.650" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="119">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
300.000 300.000 300.000 300.000 301.667 303.333 305.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 310.000 313.750 317.500 321.250 325.000 325.000 325.000 326.250 327.500 328.750 330.000 331.250 332.500 333.750 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 341.667 343.333 345.000 346.667 348.333 350.000 351.667 353.333 355.000 355.000 355.000 360.000 360.000 365.000 367.000 369.000 371.000 373.000 375.000 375.000 380.000 381.667 383.333 385.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 410.000 415.000 415.000 418.802 422.604 426.406 430.208 434.010 437.811 441.613 445.415 449.217 453.019 456.821 460.623 464.425 468.227 472.029 475.831 479.633 483.434 487.236 491.038 494.840 498.642 502.444 506.246 510.048 515.000 520.000 525.000 535.000 540.000 550.000 560.000 570.000 580.000 595.000 610.000 625.000 647.833
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 69 66 0 0 63 54 54 0 54 60 60 57 0 0 57 0 54 51 51 0 0 0 0 0 0 0 54 0 0 0 0 0 63 66 69 69 0 0 0 0 0 0 0 0 78 72 0 69 0 75 0 0 57 0 69 72 66 0 0 60 66 69 63 66 63 69 69 78 75 78 81 81 81 81 75 78 75 78 81 0 0 51 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
</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 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -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 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 1.953125 -1.171875 -1.171875 1.953125 -1.171875 -0.390625 0.390625 -0.390625 1.171875 1.953125 0.390625 -2.734375 2.734375 2.734375 1.953125 -0.390625 2.734375 -1.171875 2.734375 2.734375 1.953125 1.953125 2.734375 1.953125 1.953125 2.734375 1.171875 1.171875 -1.171875 1.953125 0.390625 -0.390625 -1.171875 -1.953125 0.390625 -0.390625 -0.390625 1.171875 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="35">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 115.000 115.000 112.500 110.000 107.500 105.000 105.000 115.000 110.000 110.000 110.000 114.375 118.750 123.125 127.500 131.875 136.250 140.625 145.000 135.000 130.000 125.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 135.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
72 0 0 75 0 0 0 0 0 72 69 0 0 63 0 0 0 0 0 0 54 57 0 60 54 0 54 57 0 0 0 0 54 0 54
</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 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.961 90.0 95.0 100.0 105.0 110.0 115.0 120.0 121.683 125.0 130.0 133.367 135.0 140.0 145.0 145.05 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 389.958 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.203 0.965 1.251 1.398 1.444 1.418 1.336 1.295 1.295 1.295 1.295 1.316 1.38 1.443 1.444 1.583 1.717 1.852 1.991 2.135 2.285 2.443 2.609 2.785 2.969 3.164 3.367 3.579 3.799 4.026 4.259 4.497 4.738 4.982 5.228 5.474 5.721 5.968 6.214 6.459 6.702 6.943 7.182 7.418 7.652 7.882 8.109 8.331 8.549 8.762 8.968 9.168 9.359 9.542 9.714 9.875 10.023 10.155 10.271 10.369 10.447 10.504 10.539 10.55 10.55 10.545 10.531 10.509 10.478 10.439 10.392 10.339 10.279 10.212 10.14 10.063 9.98 9.893 9.801 9.705 9.606 9.503 9.397 9.289 9.178 9.065 8.95 8.833 8.715 8.595 8.475 8.354 8.232 8.109 7.987 7.864 7.741 7.619 7.496 7.374 7.253 7.132 7.012 6.893 6.774 6.657 6.54 6.425 6.31 6.197 6.085 5.974 5.865 5.757 5.65 5.545 5.441 5.338 5.237 5.138 5.04 4.943 4.848 4.754 4.662 4.571 4.481 4.393 4.307 4.222 4.138 4.056 3.976 3.896 3.818 3.742 3.667 3.593 3.521 3.449 3.38 3.311 3.244 3.178 3.113 3.05 2.987 2.926 2.866 2.808 2.75 2.694 2.638 2.584 2.531 2.478 2.427 2.377 2.328 2.28 2.232 2.186 2.141 2.096 2.053 2.01 1.968 1.927 1.887 1.848 1.81 1.772 1.735 1.699 1.663 1.628 1.594 1.561 1.528 1.496 1.465 1.435 1.405 1.375 1.346 1.318 1.29

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.444" PeakHeight="110.0" Num="3" Error="0.0">
-27.989 9.718 -1.768
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.444" EndFrequency="10.55" PeakHeight="389.958" Num="5" zHalfNm="290.886" Error="3.696">
-238.355 -12.013 7.819 -4.361 2.002
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="35.05" Depth="0.149"/>
<TopsideChapman PeakHeight="389.958" PeakDensity="1380924.4" PeakScaleHeight="73.369" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
