<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-26 -026 21:20:00.000"
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 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" >
2026.01.26 (026) 21:20:00</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">
FF202602601262120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="9.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.130" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.124" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="315.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="595.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.004" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="494.374" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="349.779" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.414" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.100" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="206.060" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="49.314" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="105.222" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="201.690" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.120" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="127">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 315.000 315.000 315.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 327.500 330.000 330.000 330.000 330.000 331.667 333.333 335.000 336.667 338.333 340.000 340.000 345.000 347.000 349.000 351.000 353.000 355.000 356.667 358.333 360.000 362.500 365.000 365.000 365.000 367.333 369.667 372.000 374.333 376.667 379.000 381.333 383.667 386.000 388.333 390.667 393.000 395.333 397.667 400.000 402.333 404.667 407.000 409.333 411.667 414.000 416.333 418.667 421.000 423.333 425.667 428.000 430.333 432.667 435.000 440.000 445.000 449.000 453.000 457.000 461.000 465.000 470.000 475.000 475.000 475.000 480.000 485.000 490.000 495.000 500.000 504.375 508.750 513.125 517.500 521.875 526.250 530.625 535.000 535.000 535.000 545.000 550.000 550.000 550.000 560.000 565.000 565.000 575.000 580.000 580.000 585.000 590.000 595.000 602.500 610.000 615.000 620.000 625.000 633.750 642.500 651.250 660.000 665.000 670.000 685.000 695.000 705.000 717.556 731.230 746.176 762.582 780.671 800.719 823.059 848.111
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 0 63 63 69 63 60 66 75 66 0 0 0 63 63 0 0 0 0 0 69 69 63 0 60 0 0 57 0 0 0 0 48 54 66 0 0 0 0 0 0 0 0 0 0 0 48 0 0 0 0 51 0 60 0 0 0 0 0 0 0 60 0 0 0 57 60 0 0 57 0 69 66 60 69 66 54 54 54 51 54 0 0 0 0 0 0 0 51 63 60 63 57 63 69 75 75 66 63 60 66 66 69 63 0 51 51 51 48 0 0 0 45 54 60 60 57 57 57 54 54 51 45 0 63 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -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 -1.953125 -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 -0.390625 -1.171875 0.390625 -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 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -2.734375 -1.953125 -2.734375 0.390625 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="20">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 105.500 106.000 106.500 107.000 107.500 108.000 108.500 109.000 109.500 110.000 105.000 107.500 110.000 110.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 66 72 0 0 0 0 0 0 0 0 0 66 69 0 69 63 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 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.266 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.853 130.0 135.0 140.0 143.706 145.0 150.0 155.0 160.0 160.559 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 494.374 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.668 0.87 0.972 1.004 0.987 0.935 0.841 0.794 0.794 0.794 0.794 0.794 0.81 0.872 0.935 0.997 1.004 1.083 1.162 1.237 1.312 1.389 1.468 1.552 1.641 1.737 1.841 1.954 2.078 2.215 2.366 2.531 2.712 2.905 3.109 3.319 3.532 3.745 3.954 4.159 4.358 4.552 4.741 4.925 5.104 5.278 5.448 5.614 5.776 5.936 6.092 6.245 6.395 6.543 6.689 6.832 6.973 7.111 7.248 7.382 7.514 7.644 7.772 7.898 8.021 8.141 8.259 8.373 8.485 8.592 8.696 8.796 8.89 8.98 9.063 9.14 9.21 9.272 9.326 9.371 9.406 9.431 9.446 9.45 9.45 9.447 9.441 9.43 9.416 9.398 9.377 9.352 9.324 9.292 9.258 9.221 9.181 9.139 9.094 9.046 8.996 8.945 8.891 8.835 8.777 8.717 8.656 8.594 8.53 8.464 8.397 8.33 8.261 8.191 8.12 8.048 7.976 7.902 7.829 7.754 7.68 7.604 7.529 7.453 7.377 7.3 7.224 7.147 7.07 6.994 6.917 6.841 6.764 6.688 6.612 6.536 6.46 6.385 6.31 6.235 6.161 6.087 6.013 5.94 5.867 5.795 5.723 5.652 5.581 5.511 5.441 5.372 5.303 5.235 5.167 5.101 5.034 4.969 4.904 4.839 4.775 4.712 4.65 4.588 4.526 4.466 4.406 4.346 4.287 4.229 4.172 4.115 4.059 4.003 3.948 3.894 3.84 3.787 3.735 3.683 3.632 3.582 3.532 3.482 3.434 3.386

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.004" PeakHeight="110.0" Num="3" Error="0.0">
-26.523 8.015 -1.226
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.004" EndFrequency="9.45" PeakHeight="494.374" Num="5" zHalfNm="349.779" Error="7.581">
-342.947 6.497 11.253 -16.235 7.617
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="50.559" Depth="0.21"/>
<TopsideChapman PeakHeight="494.374" PeakDensity="1107971.5" PeakScaleHeight="105.222" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
