<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 17:00:00.000"
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 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" >
2026.02.22 (053) 17:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605302221700009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.672" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.399" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.410" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="110.216" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.751" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.479" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.270" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.305" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="347.057" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="258.167" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.112" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="117.999" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.564" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="67.029" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="149.000" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.360" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="146">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 225.000 230.000 240.000 250.000 260.000 270.000 275.000 280.000 285.000 290.000 291.667 293.333 295.000 295.000 295.000 296.250 297.500 298.750 300.000 303.333 306.667 310.000 310.000 310.000 310.000 315.000 317.500 320.000 320.000 317.500 315.000 320.000 320.000 322.500 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 336.250 337.500 338.750 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 361.667 363.333 365.000 366.667 368.333 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 387.500 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 402.500 405.000 407.500 410.000 412.500 415.000 415.000 415.000 417.500 420.000 420.000 425.000 425.000 422.500 420.000 425.000 430.000 435.000 440.000 440.000 443.333 446.667 450.000 450.000 455.000 458.333 461.667 465.000 465.000 470.000 475.000 482.500 490.000 496.920 504.603 513.183 522.825 533.740 546.198 560.551 577.268
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 45 0 51 0 51 54 45 48 48 0 0 45 51 48 0 48 0 51 0 0 54 0 45 54 54 0 45 45 0 48 57 60 0 54 60 60 51 57 57 57 0 57 48 63 0 0 0 57 60 57 60 60 57 57 0 57 57 51 63 60 60 54 51 66 0 63 63 69 69 0 0 0 0 0 63 66 69 69 66 63 63 63 66 60 66 54 60 66 42 54 54 63 63 69 63 63 63 66 57 63 66 66 66 0 63 0 60 45 54 0 57 0 51 57 48 57 0 0 54 51 0 48 51 0 0 48 51 45 0 0 51 45 48 48 0 42 45 0 0 0 0 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 1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -2.734375 -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 -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 -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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 -2.734375 0.390625 2.734375 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 2.734375 1.171875 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 -0.390625 -0.390625 1.171875 1.171875 1.171875 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.2 3.25 3.3 3.35 3.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.216 111.540 113.206 115.486 119.243
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375 0.390625 2.734375 1.171875
</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 95.0 100.0 100.751 102.797 104.842 105.0 106.888 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.057 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.851 3.401 3.41 3.282 3.282 3.292 3.41 3.498 3.63 3.755 3.877 3.997 4.116 4.236 4.357 4.479 4.604 4.732 4.863 4.997 5.136 5.279 5.427 5.58 5.739 5.904 6.075 6.253 6.438 6.629 6.828 7.034 7.246 7.465 7.69 7.921 8.157 8.397 8.64 8.885 9.132 9.379 9.626 9.87 10.11 10.346 10.575 10.794 11.001 11.193 11.364 11.511 11.627 11.707 11.746 11.75 11.748 11.734 11.709 11.672 11.625 11.568 11.502 11.427 11.343 11.252 11.154 11.05 10.939 10.824 10.703 10.578 10.448 10.315 10.179 10.04 9.899 9.756 9.611 9.464 9.316 9.168 9.019 8.869 8.72 8.57 8.421 8.272 8.123 7.976 7.829 7.684 7.539 7.396 7.254 7.114 6.975 6.838 6.702 6.568 6.436 6.306 6.177 6.051 5.926 5.803 5.682 5.563 5.446 5.331 5.218 5.107 4.998 4.891 4.785 4.682 4.581 4.481 4.383 4.288 4.194 4.102 4.012 3.923 3.837 3.752 3.668 3.587 3.507 3.429 3.352 3.278 3.204 3.132 3.062 2.993 2.926 2.86 2.796 2.732 2.671 2.61 2.551 2.493 2.437 2.382 2.328 2.275 2.223 2.172 2.123 2.075 2.027 1.981 1.936 1.892 1.849 1.806 1.765 1.725 1.685 1.647 1.609 1.572 1.536 1.501 1.467 1.433 1.4 1.368 1.337 1.306 1.276 1.247 1.218 1.19 1.163 1.136 1.11 1.085 1.06 1.035 1.012 0.988 0.966 0.944 0.922

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.41" PeakHeight="100.751" Num="3" Error="2.758">
-15.987 6.901 -1.665
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.41" EndFrequency="11.75" PeakHeight="347.057" Num="5" zHalfNm="258.167" Error="5.069">
-189.744 -55.404 3.118 -0.154 2.015
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.137" Depth="0.128"/>
<TopsideChapman PeakHeight="347.057" PeakDensity="1712934.2" PeakScaleHeight="67.029" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
