<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-10 -041 20:00:00.000"
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 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" >
2026.02.10 (041) 20:00:00</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">
FF202604102102000009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="10.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.420" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.287" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.050" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.400" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.460" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="118.681" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="537.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.315" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="386.820" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="270.604" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.475" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="155.333" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.929" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.375" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="181.260" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 265.000 265.000 267.500 270.000 272.500 275.000 277.500 280.000 280.000 280.000 280.000 280.000 280.000 282.000 284.000 286.000 288.000 290.000 292.000 294.000 296.000 298.000 300.000 302.000 304.000 306.000 308.000 310.000 312.000 314.000 316.000 318.000 320.000 325.000 325.000 325.000 330.000 330.000 332.500 335.000 340.000 340.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 420.000 425.000 430.000 430.000 440.000 440.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 465.000 470.000 470.000 470.000 475.000 475.000 480.000 480.000 480.000 485.000 490.000 495.000 495.000 495.000 500.000 505.000 505.000 510.000 515.000 520.000 520.000 525.000 529.000 533.000 537.000 541.000 545.000 552.500 560.000 565.000 571.829 579.302 587.512 596.575 606.632 617.855 630.460 644.718
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 54 48 0 0 0 63 0 60 63 60 0 54 48 0 0 0 0 0 0 0 0 45 0 0 48 0 0 0 0 0 0 0 66 57 66 66 63 66 0 66 57 63 54 63 66 63 69 63 69 66 69 66 69 66 69 66 69 66 69 66 57 69 63 69 66 60 69 63 69 66 63 69 69 69 69 69 63 69 66 60 66 63 69 63 66 63 57 63 66 66 69 66 69 66 69 0 51 60 66 63 57 63 63 60 54 60 60 0 0 0 0 51 0 51 54 51 51 48 51 48 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 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -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 -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 -1.171875 1.171875 -2.734375 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 1.171875 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.4 2.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
118.681 122.516
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="32">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 125.000 125.000 122.500 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 120.000 116.667 113.333 110.000 110.000 112.500 115.000 115.000 115.000 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 0 57 57 57 0 60 63 0 0 0 66 57 0 0 0 54 54 0 69 69 0 69 69 54 54 54 63 63 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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
</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" >
89.648 90.0 95.0 100.0 105.0 110.0 115.0 116.522 120.0 123.045 125.0 129.567 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 386.82 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.651 2.13 2.38 2.46 2.381 2.325 2.325 2.325 2.365 2.46 2.472 2.608 2.742 2.877 3.016 3.161 3.312 3.471 3.639 3.816 4.001 4.193 4.391 4.594 4.799 5.003 5.207 5.408 5.605 5.799 5.988 6.173 6.355 6.532 6.706 6.876 7.043 7.208 7.37 7.529 7.687 7.843 7.997 8.149 8.3 8.45 8.599 8.747 8.894 9.04 9.186 9.33 9.473 9.615 9.754 9.89 10.021 10.143 10.254 10.347 10.414 10.447 10.45 10.448 10.44 10.424 10.401 10.372 10.337 10.295 10.248 10.195 10.137 10.075 10.008 9.936 9.861 9.782 9.7 9.614 9.525 9.434 9.34 9.244 9.146 9.046 8.944 8.841 8.737 8.631 8.525 8.417 8.309 8.2 8.091 7.982 7.872 7.763 7.653 7.544 7.434 7.325 7.217 7.109 7.001 6.894 6.788 6.682 6.578 6.474 6.37 6.268 6.167 6.067 5.967 5.869 5.772 5.676 5.581 5.487 5.394 5.302 5.212 5.122 5.034 4.947 4.861 4.777 4.693 4.611 4.53 4.45 4.371 4.294 4.217 4.142 4.068 3.995 3.923 3.853 3.783 3.715 3.647 3.581 3.516 3.452 3.389 3.327 3.266 3.206 3.148 3.09 3.033 2.977 2.922 2.868 2.815 2.763 2.712 2.661 2.612 2.563 2.516 2.469 2.423 2.378 2.333 2.29 2.247 2.205 2.164 2.123 2.083 2.044 2.006 1.968 1.931 1.895 1.86 1.825 1.79 1.757 1.724 1.691 1.659 1.628

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.46" PeakHeight="110.0" Num="3" Error="0.0">
-29.67 11.948 -2.63
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.46" EndFrequency="10.45" PeakHeight="386.82" Num="5" zHalfNm="270.604" Error="3.424">
-230.295 -44.694 28.616 -14.97 4.09
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="19.567" Depth="0.135"/>
<TopsideChapman PeakHeight="386.82" PeakDensity="1354869.8" PeakScaleHeight="81.375" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
