<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 20:50:00.000"
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" >
2026.02.28 (059) 20:50:00</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">
FF202605902282050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="12.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.694" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.000" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.550" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="1.610" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="91.174" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="90.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.950" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="481.207" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.595" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="362.490" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="292.579" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.282" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="99.538" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.080" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="49.559" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="116.220" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.300" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="179">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 265.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 277.500 280.000 275.000 275.000 275.000 276.667 278.333 280.000 281.667 283.333 285.000 285.000 285.000 285.000 285.000 285.000 285.000 287.500 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 311.429 312.857 314.286 315.714 317.143 318.571 320.000 320.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 340.000 340.000 341.667 343.333 345.000 345.000 350.000 350.000 355.000 355.000 355.000 360.000 361.667 363.333 365.000 366.250 367.500 368.750 370.000 370.000 375.000 376.000 377.000 378.000 379.000 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 405.000 406.000 407.000 408.000 409.000 410.000 410.000 415.000 415.000 415.000 416.667 418.333 420.000 421.667 423.333 425.000 425.000 430.000 430.000 430.000 430.000 431.667 433.333 435.000 435.000 437.500 440.000 442.500 445.000 445.000 445.000 446.667 448.333 450.000 450.000 450.000 450.000 460.000 460.000 461.667 463.333 465.000 465.000 466.667 468.333 470.000 471.667 473.333 475.000 476.667 478.333 481.207 484.642 488.820 494.010 500.634 509.378 521.455
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 0 0 0 0 48 57 57 60 0 54 54 51 51 54 0 66 66 0 60 63 0 57 63 60 51 0 0 0 0 0 54 63 0 54 0 57 54 0 60 0 0 0 60 0 0 48 48 0 51 0 66 66 0 63 57 0 63 0 0 0 0 60 0 63 60 66 54 63 66 66 66 63 66 66 54 60 66 0 0 69 69 63 69 54 63 66 51 0 0 48 0 0 0 54 60 48 0 0 0 0 57 0 66 66 66 66 60 60 0 63 60 63 66 0 57 60 0 0 60 63 0 0 0 0 66 60 57 60 63 0 0 0 0 0 57 63 48 0 0 57 0 0 54 54 0 48 0 48 0 57 0 0 54 54 0 0 45 51 0 0 54 57 0 0 51 0 51 0 54 0 0 54 54 0 45 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -1.171875 -0.390625 -0.390625 1.171875 -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 -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 1.953125 -0.390625 -0.390625 1.953125 -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 2.734375 -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 -1.171875 -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 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.55 1.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
91.174 92.592
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="15">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
90.000 90.000 90.000 90.000 90.000 90.000 90.000 90.000 91.250 92.500 93.750 95.000 90.000 90.000 90.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 57 0 0 0 60 63 0 60 0 57 0 57 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
</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" >
89.89 90.0 95.0 100.0 105.0 110.0 115.0 120.0 120.626 125.0 130.0 131.251 135.0 140.0 141.877 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 362.49 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.21 1.077 1.395 1.558 1.61 1.579 1.483 1.466 1.466 1.466 1.466 1.517 1.585 1.61 1.697 1.834 1.973 2.117 2.269 2.431 2.604 2.79 2.99 3.205 3.434 3.675 3.929 4.191 4.459 4.732 5.008 5.284 5.56 5.835 6.108 6.38 6.651 6.92 7.188 7.456 7.722 7.989 8.256 8.524 8.792 9.062 9.334 9.608 9.885 10.164 10.447 10.733 11.021 11.309 11.593 11.861 12.09 12.231 12.25 12.247 12.223 12.178 12.112 12.027 11.925 11.807 11.675 11.53 11.374 11.207 11.032 10.849 10.659 10.464 10.264 10.061 9.854 9.646 9.435 9.225 9.014 8.803 8.593 8.384 8.177 7.972 7.769 7.569 7.371 7.176 6.985 6.796 6.611 6.43 6.252 6.078 5.907 5.74 5.577 5.418 5.262 5.11 4.962 4.817 4.677 4.539 4.406 4.275 4.149 4.025 3.905 3.789 3.675 3.565 3.458 3.353 3.252 3.154 3.058 2.965 2.875 2.788 2.703 2.62 2.54 2.463 2.387 2.314 2.243 2.175 2.108 2.043 1.98 1.919 1.86 1.803 1.748 1.694 1.642 1.591 1.542 1.494 1.448 1.403 1.36 1.318 1.277 1.238 1.2 1.162 1.126 1.092 1.058 1.025 0.993 0.963 0.933 0.904 0.876 0.849 0.822 0.797 0.772 0.748 0.725 0.703 0.681 0.66 0.639 0.619 0.6 0.582 0.564 0.546 0.529 0.513 0.497 0.481 0.467 0.452 0.438 0.424 0.411 0.399 0.386 0.374 0.363

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.61" PeakHeight="110.0" Num="3" Error="0.0">
-28.368 10.197 -1.939
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.61" EndFrequency="12.25" PeakHeight="362.49" Num="5" zHalfNm="292.579" Error="2.619">
-185.62 -52.771 27.224 -13.229 3.783
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="31.877" Depth="0.144"/>
<TopsideChapman PeakHeight="362.49" PeakDensity="1861817.6" PeakScaleHeight="49.559" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
