<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, 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" >
2026.01.31 (031) 20:40:00</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">
FF202603101312040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="9.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.539" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.993" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.650" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="1.860" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="99.671" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="96.167" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="6.106" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="491.009" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.803" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="382.351" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="271.605" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.748" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="154.354" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="38.753" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="82.030" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="155.960" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.050" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="139">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 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" >
250.000 250.000 250.000 252.500 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 272.500 275.000 275.000 280.000 280.000 280.000 280.000 280.000 282.500 285.000 287.500 290.000 290.000 290.000 290.000 292.500 295.000 297.500 300.000 300.000 300.000 300.000 300.000 305.000 305.000 307.500 310.000 310.000 310.000 311.667 313.333 315.000 315.833 316.667 317.500 318.333 319.167 320.000 323.333 326.667 330.000 335.000 335.000 335.000 336.875 338.750 340.625 342.500 344.375 346.250 348.125 350.000 350.000 355.000 355.000 360.000 360.000 362.500 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 395.000 396.250 397.500 398.750 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 440.000 450.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 475.000 480.000 480.000 480.000 485.000 487.830 491.009 494.604 498.704 503.424 508.914 515.380 523.108 532.508 544.187 559.090 578.764 605.936 645.906 710.495
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 60 66 0 72 72 72 72 66 69 69 69 69 69 72 75 75 72 69 69 0 69 69 63 0 69 63 0 63 63 63 60 0 0 0 0 0 0 69 0 0 0 0 0 0 66 66 0 66 54 60 60 48 0 0 45 0 0 0 0 0 66 0 0 66 57 63 69 0 0 0 0 0 51 0 63 63 60 66 60 66 0 66 57 63 69 63 66 60 66 60 63 63 54 0 0 0 66 63 66 66 63 66 66 63 66 69 66 66 69 66 63 57 66 63 66 63 60 66 66 63 66 66 63 66 69 69 66 66 66 69 60 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 -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 -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 -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 -1.953125 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 -1.953125 1.953125 -0.390625 2.734375 1.953125 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.65 1.7 1.75 1.8 1.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
99.671 100.677 101.848 103.250 105.009
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 1.953125 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" >
90.0 95.0 96.167 100.0 105.0 105.504 110.0 114.84 115.0 120.0 124.177 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 382.351 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.825 1.86 1.837 1.734 1.719 1.719 1.719 1.721 1.797 1.86 1.876 1.97 2.063 2.156 2.252 2.35 2.453 2.559 2.671 2.789 2.914 3.047 3.188 3.339 3.5 3.671 3.852 4.043 4.243 4.452 4.666 4.886 5.107 5.33 5.552 5.772 5.989 6.202 6.412 6.617 6.818 7.014 7.205 7.391 7.572 7.748 7.918 8.082 8.24 8.392 8.537 8.674 8.803 8.922 9.032 9.132 9.219 9.294 9.355 9.401 9.433 9.448 9.45 9.449 9.442 9.429 9.409 9.384 9.353 9.316 9.275 9.228 9.177 9.122 9.062 8.999 8.932 8.862 8.789 8.713 8.634 8.553 8.469 8.383 8.296 8.206 8.116 8.024 7.93 7.836 7.74 7.644 7.547 7.45 7.352 7.254 7.156 7.058 6.959 6.861 6.763 6.665 6.568 6.47 6.374 6.278 6.182 6.087 5.993 5.899 5.806 5.714 5.623 5.532 5.443 5.354 5.266 5.179 5.094 5.009 4.925 4.842 4.76 4.68 4.6 4.521 4.444 4.367 4.291 4.217 4.144 4.071 4.0 3.93 3.86 3.792 3.725 3.659 3.594 3.53 3.467 3.404 3.343 3.283 3.224 3.166 3.109 3.052 2.997 2.943 2.889 2.836 2.785 2.734 2.684 2.635 2.586 2.539 2.492 2.447 2.402 2.357 2.314 2.271 2.229 2.188 2.147 2.108 2.069 2.03 1.993 1.956 1.919 1.884 1.849 1.814 1.78 1.747 1.715 1.683 1.651 1.621 1.59 1.561 1.532 1.503 1.475

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.86" PeakHeight="96.167" Num="3" Error="1.872">
-8.805 3.301 -0.663
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.86" EndFrequency="9.45" PeakHeight="382.351" Num="5" zHalfNm="271.605" Error="3.863">
-241.268 -14.741 0.01 -5.015 2.84
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="28.01" Depth="0.141"/>
<TopsideChapman PeakHeight="382.351" PeakDensity="1107971.5" PeakScaleHeight="82.03" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
