<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-11 -042 12:40:00.000"
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" >
2026.02.11 (042) 12:40:00</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">
FF202604202111240009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.600" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.557" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.750" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.160" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="109.519" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="101.844" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="11.566" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="470.000" 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="3.139" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.242" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="346.643" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="246.943" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.068" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="129.386" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.190" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.299" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="167.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="118">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 260.000 260.000 265.000 268.750 272.500 276.250 280.000 285.000 285.000 290.000 290.000 290.000 295.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 311.250 312.500 313.750 315.000 315.000 320.000 320.000 320.000 320.000 322.500 325.000 330.000 330.000 330.000 330.000 330.000 330.000 333.333 336.667 340.000 345.000 345.000 345.000 345.000 347.000 349.000 351.000 353.000 355.000 360.000 360.000 360.000 360.000 365.000 370.000 370.000 370.000 370.000 372.500 375.000 375.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 430.000 435.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 475.000 480.000 485.000 490.000 490.000 495.000 500.000 505.000 510.000 517.037 525.456 535.708 548.464 564.772 586.352
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 45 0 48 0 51 54 54 57 57 45 51 48 57 57 57 60 0 60 57 0 0 0 51 57 54 0 60 57 0 60 51 0 60 0 60 54 0 0 63 54 57 60 63 0 0 0 0 63 54 0 66 63 57 51 60 60 66 0 66 66 0 54 60 60 57 66 66 66 66 63 69 57 66 57 63 60 66 60 66 63 57 57 66 60 54 66 66 54 60 66 60 63 60 63 57 60 63 60 60 60 60 57 54 48 54 57 54 54 51 54 51 51 48 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 0.390625 -0.390625 1.953125 0.390625 2.734375 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 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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>
<Trace Type="standard" Layer="E" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
109.519 110.090 110.710 111.388 112.138 112.977 113.931 115.039 116.367
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 51 0 0 51 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 1.953125 2.734375 -0.390625 -1.171875 1.171875 -0.390625 2.734375 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 95.0 100.0 101.844 104.451 105.0 107.057 109.664 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 346.643 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.552 3.118 3.16 3.037 3.037 3.037 3.16 3.171 3.321 3.464 3.602 3.738 3.874 4.01 4.148 4.288 4.43 4.575 4.722 4.872 5.026 5.182 5.342 5.504 5.669 5.836 6.006 6.178 6.352 6.528 6.705 6.884 7.063 7.244 7.425 7.606 7.789 7.971 8.154 8.336 8.519 8.701 8.883 9.064 9.244 9.423 9.599 9.771 9.939 10.098 10.246 10.377 10.485 10.561 10.598 10.6 10.598 10.587 10.566 10.537 10.499 10.454 10.401 10.342 10.275 10.203 10.125 10.041 9.953 9.86 9.763 9.662 9.557 9.45 9.339 9.226 9.111 8.994 8.875 8.754 8.633 8.51 8.386 8.262 8.137 8.012 7.887 7.762 7.637 7.512 7.388 7.264 7.141 7.019 6.897 6.777 6.657 6.539 6.421 6.305 6.19 6.076 5.964 5.853 5.743 5.635 5.528 5.423 5.319 5.216 5.115 5.016 4.918 4.822 4.727 4.634 4.542 4.452 4.363 4.276 4.19 4.106 4.023 3.941 3.861 3.783 3.706 3.63 3.556 3.483 3.412 3.342 3.273 3.205 3.139 3.074 3.011 2.948 2.887 2.827 2.768 2.71 2.654 2.598 2.544 2.491 2.438 2.387 2.337 2.288 2.24 2.193 2.147 2.102 2.057 2.014 1.971 1.93 1.889 1.849 1.81 1.772 1.734 1.697 1.662 1.626 1.592 1.558 1.525 1.493 1.461 1.43 1.4 1.37 1.341 1.312 1.284 1.257 1.23 1.204 1.178 1.153 1.129 1.105 1.081 1.058 1.036

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.16" PeakHeight="101.844" Num="3" Error="4.477">
-17.538 7.457 -1.763
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.16" EndFrequency="10.6" PeakHeight="346.643" Num="5" zHalfNm="246.943" Error="3.169">
-195.547 -54.72 15.6 -4.03 1.718
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.82" Depth="0.123"/>
<TopsideChapman PeakHeight="346.643" PeakDensity="1394044.6" PeakScaleHeight="72.299" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
