<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-10 -041 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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.02.10 (041) 21:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202604102102120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.454" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.538" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.100" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.150" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="118.750" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.017" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="401.928" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="304.846" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.139" 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="138.956" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.423" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="70.811" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="139.130" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.970" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.800" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="145">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 280.000 285.000 280.000 280.909 281.818 282.727 283.636 284.545 285.455 286.364 287.273 288.182 289.091 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 301.250 302.500 303.750 305.000 305.000 307.500 310.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 316.250 317.500 318.750 320.000 320.000 320.000 320.000 322.500 325.000 325.000 335.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 341.500 343.000 344.500 346.000 347.500 349.000 350.500 352.000 353.500 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 390.000 390.000 390.000 392.500 395.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 465.000 465.000 470.000 475.000 480.000 485.000 490.000 490.000 490.000 500.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 540.000 550.000 555.000 560.000 568.750 577.500 586.250 597.125 609.850 624.940 643.125
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 57 60 54 51 0 0 0 0 0 63 0 0 0 0 69 63 0 0 0 0 60 63 60 0 63 57 0 0 0 63 69 0 60 57 57 60 63 0 66 57 0 60 63 0 0 0 0 0 57 0 0 66 0 54 66 0 69 66 69 72 66 69 54 0 0 0 60 0 0 63 0 69 63 0 72 66 69 72 69 75 66 72 48 69 60 72 75 69 69 72 0 72 0 66 72 75 72 63 72 75 75 75 75 69 75 69 72 69 63 69 66 63 63 60 57 54 54 54 51 51 48 45 60 54 54 57 60 63 63 60 60 57 0 54 60 60 57 0 0 0 51 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="42">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 115.000 110.000 115.000 115.625 116.250 116.875 117.500 118.125 118.750 119.375 120.000 120.000 120.000 120.000 120.000 118.333 116.667 115.000 120.000 120.000 119.375 118.750 118.125 117.500 116.875 116.250 115.625 115.000 135.000 120.000 125.000 130.000 125.000 130.000 131.250 132.500 133.750 135.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 63 66 60 0 60 0 0 0 0 60 0 0 75 81 75 60 0 0 0 63 75 63 0 0 0 0 0 0 0 75 66 78 0 63 72 51 0 0 0 57 69
</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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.253 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.584 130.0 135.0 140.0 143.168 145.0 150.0 155.0 159.752 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 401.928 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.677 0.881 0.985 1.017 1.0 0.947 0.853 0.812 0.812 0.812 0.812 0.812 0.835 0.896 0.958 1.017 1.024 1.145 1.253 1.36 1.47 1.587 1.713 1.85 2.001 2.169 2.357 2.565 2.793 3.041 3.303 3.576 3.852 4.129 4.403 4.673 4.937 5.195 5.447 5.694 5.936 6.173 6.405 6.633 6.857 7.078 7.295 7.508 7.717 7.923 8.125 8.322 8.514 8.702 8.882 9.056 9.221 9.376 9.519 9.648 9.761 9.854 9.927 9.975 9.998 10.0 9.998 9.988 9.968 9.94 9.903 9.859 9.808 9.75 9.685 9.615 9.539 9.458 9.372 9.281 9.187 9.089 8.987 8.883 8.775 8.666 8.554 8.44 8.325 8.208 8.091 7.972 7.853 7.733 7.612 7.492 7.371 7.251 7.13 7.011 6.891 6.773 6.655 6.537 6.421 6.306 6.191 6.078 5.966 5.855 5.745 5.637 5.529 5.424 5.319 5.216 5.115 5.015 4.916 4.819 4.724 4.63 4.537 4.446 4.356 4.268 4.181 4.096 4.012 3.93 3.849 3.77 3.692 3.616 3.541 3.467 3.395 3.324 3.254 3.186 3.119 3.054 2.989 2.926 2.864 2.804 2.744 2.686 2.629 2.573 2.518 2.465 2.412 2.36 2.31 2.261 2.212 2.165 2.118 2.073 2.028 1.985 1.942 1.9 1.859 1.819 1.78 1.741 1.704 1.667 1.631 1.596 1.561 1.528 1.494 1.462 1.43 1.399 1.369 1.339 1.31 1.282 1.254 1.227 1.2 1.174

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.017" PeakHeight="110.0" Num="3" Error="0.0">
-26.579 8.077 -1.245
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.017" EndFrequency="10.0" PeakHeight="401.928" Num="5" zHalfNm="304.846" Error="5.868">
-240.699 -6.257 10.4 -10.536 4.916
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.752" Depth="0.205"/>
<TopsideChapman PeakHeight="401.928" PeakDensity="1240694.8" PeakScaleHeight="70.811" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
