<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-17 -048 18:40:00.000"
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 11 0 0 0 0 0 0 0 0 0 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" >
2026.02.17 (048) 18:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202604802171840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="11.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.709" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.103" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="7.450" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.650" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.060" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="110.889" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="103.843" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="13.529" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.750" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="476.275" 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="2.895" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="339.829" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="261.922" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.589" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.100" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="101.257" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.720" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="56.726" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="151.030" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="6.350" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="111">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 340.000 340.000 340.000 341.250 342.500 343.750 345.000 346.250 347.500 348.750 350.000 351.250 352.500 353.750 355.000 356.667 358.333 360.000 360.000 360.000 360.000 365.000 365.000 366.250 367.500 368.750 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 380.000 385.000 385.000 385.000 390.000 390.000 392.500 395.000 390.000 395.000 397.500 400.000 400.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 420.000 420.000 425.000 426.250 427.500 428.750 430.000 431.250 432.500 433.750 435.000 440.000 440.000 440.000 442.500 445.000 440.000 445.000 445.000 445.000 450.000 455.000 460.000 460.000 461.339 462.816 464.453 466.276 468.321 470.630 473.258 476.275 479.776 483.886 488.780 494.705 502.027 511.304
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 60 63 0 0 0 0 66 0 51 0 57 0 0 60 0 0 69 69 69 69 63 66 0 0 0 66 69 63 63 57 69 63 57 60 60 57 60 57 60 0 48 63 60 0 48 0 60 63 63 66 69 69 72 0 72 66 69 0 72 69 66 63 60 66 66 66 63 63 63 0 63 0 57 63 0 0 0 0 0 0 0 60 48 0 57 0 51 0 54 54 48 0 54 45 48 57 51 0 51 48 48 45 0 48 45 54 54 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 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 -1.171875 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
110.889 111.645 112.491 113.453 114.570 115.909 117.591 119.891 123.673
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 54 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 -2.734375 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="88">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 115.000 118.333 121.667 125.000 120.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 120.000 117.500 115.000 112.500 110.000 110.000 112.000 114.000 116.000 118.000 120.000 120.000 119.375 118.750 118.125 117.500 116.875 116.250 115.625 115.000 110.000 110.000 110.227 110.455 110.682 110.909 111.136 111.364 111.591 111.818 112.045 112.273 112.500 112.727 112.955 113.182 113.409 113.636 113.864 114.091 114.318 114.545 114.773 115.000 115.000 115.000 115.000 110.000 110.250 110.500 110.750 111.000 111.250 111.500 111.750 112.000 112.250 112.500 112.750 113.000 113.250 113.500 113.750 114.000 114.250 114.500 114.750 115.000 115.000 115.000 115.000 115.000 115.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 51 0 51 54 57 66 0 63 63 69 63 60 57 0 0 0 54 51 0 0 0 0 60 57 0 45 0 0 0 0 0 0 66 66 0 0 0 0 0 0 0 0 0 0 0 51 0 0 51 45 48 0 48 0 0 66 66 0 66 69 0 0 0 0 0 0 57 0 0 51 0 0 0 0 0 0 0 0 0 48 51 0 0 0 45 48
</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="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 95.0 100.0 103.843 105.0 107.533 110.0 111.222 114.912 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 339.829 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.328 2.931 3.06 3.047 2.931 2.931 2.931 3.06 3.064 3.299 3.524 3.737 3.939 4.132 4.317 4.497 4.672 4.844 5.012 5.179 5.344 5.508 5.672 5.836 6.0 6.165 6.33 6.497 6.666 6.836 7.008 7.183 7.361 7.542 7.726 7.914 8.106 8.302 8.504 8.711 8.923 9.142 9.368 9.601 9.841 10.09 10.346 10.609 10.877 11.145 11.402 11.629 11.792 11.85 11.85 11.841 11.814 11.772 11.715 11.644 11.56 11.464 11.357 11.24 11.115 10.981 10.839 10.692 10.538 10.379 10.216 10.049 9.879 9.707 9.532 9.356 9.179 9.001 8.822 8.644 8.466 8.289 8.113 7.937 7.764 7.592 7.421 7.253 7.086 6.922 6.76 6.601 6.444 6.29 6.138 5.989 5.842 5.699 5.558 5.42 5.284 5.152 5.022 4.895 4.77 4.649 4.53 4.413 4.299 4.188 4.08 3.974 3.87 3.769 3.671 3.575 3.481 3.389 3.3 3.213 3.128 3.045 2.964 2.885 2.809 2.734 2.661 2.59 2.521 2.454 2.388 2.324 2.262 2.201 2.142 2.084 2.028 1.974 1.921 1.869 1.819 1.77 1.722 1.676 1.63 1.586 1.544 1.502 1.461 1.422 1.383 1.346 1.31 1.274 1.24 1.206 1.174 1.142 1.111 1.081 1.051 1.023 0.995 0.968 0.942 0.917 0.892 0.867 0.844 0.821 0.799 0.777 0.756 0.736 0.716 0.696 0.677 0.659 0.641 0.624 0.607 0.59 0.574 0.559 0.543 0.529 0.514

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.06" PeakHeight="103.843" Num="3" Error="3.914">
-20.459 8.642 -2.026
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.06" EndFrequency="11.85" PeakHeight="339.829" Num="5" zHalfNm="261.922" Error="2.748">
-176.712 -73.082 25.967 0.114 -1.204
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.069" Depth="0.129"/>
<TopsideChapman PeakHeight="339.829" PeakDensity="1742214.6" PeakScaleHeight="56.726" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
