<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-09 -040 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" >
2026.02.09 (040) 18:40:00</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">
FF202604002091840009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="12.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.458" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.605" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.200" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.750" 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="95.277" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="93.731" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="3.680" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="520.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.890" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="398.848" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="300.438" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.588" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="137.938" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="61.508" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.641" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="167.740" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="159">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 270.000 272.500 275.000 275.000 285.000 285.000 285.000 295.000 295.000 300.000 302.500 305.000 305.000 310.000 311.250 312.500 313.750 315.000 315.000 315.000 318.333 321.667 325.000 325.000 325.000 330.000 330.000 335.000 335.000 335.000 336.000 337.000 338.000 339.000 340.000 340.000 345.000 345.000 350.000 352.500 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 367.500 370.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 437.500 440.000 440.000 445.000 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 450.000 455.000 455.000 455.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 465.000 465.000 465.000 465.000 470.000 470.000 470.000 472.500 475.000 476.250 477.500 478.750 480.000 485.000 485.000 490.000 490.000 492.500 495.000 495.000 500.000 505.000 507.500 510.000 510.000 515.000 515.000 517.500 520.000 525.000 530.000 535.000 540.000 545.000 550.000 555.000 560.000 565.000 575.000 583.502 592.988 603.637 615.679 629.406 645.197
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 54 0 54 48 51 54 54 45 54 48 0 51 54 48 0 0 0 60 57 51 0 0 63 63 0 63 66 57 0 63 0 0 0 0 63 60 69 69 66 0 63 66 0 66 63 69 66 60 69 63 63 0 63 66 66 60 63 63 0 54 66 66 69 0 66 69 69 69 63 66 72 66 69 69 66 69 66 69 69 69 69 69 66 69 66 66 69 69 66 0 66 66 60 0 66 63 63 57 63 63 60 60 60 60 63 60 60 57 54 57 60 54 54 0 60 57 57 60 57 0 54 0 0 0 51 51 51 48 48 0 48 51 0 45 0 45 51 48 48 0 42 45 48 0 0 0 51 51 51 48 51 0 48 0 0 0 42
</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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 1.171875 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 -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 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.277 95.962 96.687 97.455 98.270 99.139
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625 -1.171875 2.734375 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 125.000 125.000 125.000 124.286 123.571 122.857 122.143 121.429 120.714 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 57 57 0 54 0 48 0 0 54 63 66
</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
</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 93.731 95.0 97.448 100.0 101.164 104.881 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 398.848 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.16 2.15 2.069 2.069 2.069 2.16 2.163 2.307 2.446 2.583 2.72 2.857 2.995 3.134 3.274 3.417 3.561 3.707 3.856 4.006 4.159 4.315 4.473 4.633 4.796 4.961 5.129 5.299 5.471 5.647 5.824 6.004 6.187 6.372 6.56 6.75 6.942 7.137 7.335 7.534 7.737 7.942 8.149 8.358 8.57 8.785 9.001 9.219 9.44 9.662 9.885 10.11 10.335 10.56 10.784 11.006 11.224 11.436 11.64 11.832 12.008 12.162 12.289 12.383 12.437 12.45 12.45 12.441 12.422 12.393 12.353 12.304 12.247 12.181 12.107 12.026 11.937 11.843 11.742 11.636 11.525 11.41 11.29 11.166 11.038 10.908 10.774 10.638 10.5 10.36 10.219 10.076 9.932 9.787 9.641 9.495 9.349 9.203 9.056 8.911 8.765 8.62 8.476 8.332 8.189 8.048 7.907 7.768 7.63 7.493 7.358 7.224 7.091 6.961 6.831 6.704 6.578 6.453 6.331 6.21 6.09 5.973 5.857 5.744 5.631 5.521 5.412 5.306 5.201 5.097 4.996 4.896 4.798 4.701 4.607 4.514 4.422 4.333 4.245 4.158 4.074 3.99 3.909 3.828 3.75 3.673 3.597 3.523 3.45 3.379 3.309 3.24 3.173 3.107 3.042 2.979 2.917 2.856 2.797 2.738 2.681 2.625 2.57 2.516 2.463 2.412 2.361 2.311 2.263 2.215 2.169 2.123 2.078 2.034 1.992 1.95 1.908 1.868 1.829 1.79 1.752 1.715 1.679 1.644 1.609 1.575 1.541

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.16" PeakHeight="93.731" Num="3" Error="1.031">
-5.39 2.103 -0.444
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.16" EndFrequency="12.45" PeakHeight="398.848" Num="5" zHalfNm="300.438" Error="2.223">
-249.726 -64.419 22.959 -3.711 0.93
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="11.15" Depth="0.091"/>
<TopsideChapman PeakHeight="398.848" PeakDensity="1923108.0" PeakScaleHeight="72.641" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
