<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 18:10:00.000"
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 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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) 18:10:00</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">
FF202605902281810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="13.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.607" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="35.719" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.500" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="14.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="97.834" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.762" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.664" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.039" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.193" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="367.458" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="277.068" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.514" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="125.080" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="68.854" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="67.491" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="149.180" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="189">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1 13.15 13.2 13.25 13.3 13.35 13.4 13.45 13.5 13.55 13.6 13.65 13.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 235.000 235.000 238.333 241.667 245.000 250.000 253.333 256.667 260.000 263.333 266.667 270.000 273.333 276.667 280.000 285.000 287.500 290.000 290.000 290.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 321.250 322.500 323.750 325.000 325.000 327.000 329.000 331.000 333.000 335.000 335.000 335.000 335.000 336.000 337.000 338.000 339.000 340.000 340.000 342.500 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 365.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 387.500 390.000 390.000 390.000 390.000 390.000 390.000 391.250 392.500 393.750 395.000 395.000 400.000 400.000 400.000 400.000 401.667 403.333 405.000 406.250 407.500 408.750 410.000 411.250 412.500 413.750 415.000 415.000 416.667 418.333 420.000 420.000 420.000 422.500 425.000 427.500 430.000 425.000 425.000 427.500 430.000 432.500 435.000 435.000 435.000 440.000 445.000 447.500 450.000 452.500 455.000 455.000 456.667 458.333 460.000 460.000 465.000 470.000 470.000 475.000 480.000 485.000 485.000 490.714 496.429 502.143 507.857 513.571 519.286 525.000 530.000 535.000 545.000 554.331 564.631 576.060 588.814 603.138
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 48 0 0 48 45 0 0 0 45 0 0 0 0 48 51 0 51 0 0 0 57 57 57 48 45 51 51 51 0 60 60 60 57 60 57 54 51 51 0 51 54 57 57 57 54 48 45 57 57 51 54 0 60 54 0 0 0 54 57 0 0 0 0 45 0 51 48 0 0 0 0 51 51 0 0 0 54 57 51 51 51 0 60 60 60 63 66 63 60 60 0 54 54 57 48 0 51 60 63 54 0 60 63 66 66 66 66 66 63 0 63 0 63 66 63 57 0 0 0 60 57 57 0 0 60 0 0 60 0 0 0 0 0 0 0 48 54 0 0 48 0 54 0 51 0 42 57 57 0 0 0 57 57 0 0 57 0 54 0 54 57 0 0 54 51 54 54 48 0 0 48 51 42 0 0 0 0 0 42 48 51 48 42 0 45 0 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -2.734375 -1.953125 -0.390625 -0.390625 0.390625 0.390625 -1.953125 0.390625 -1.953125 -1.953125 -0.390625 1.953125 -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 -1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 1.953125 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 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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -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 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 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
97.834 98.295 98.789 99.319 99.891 100.513 101.194
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 0 48 48 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.953125 0.390625 -1.953125 0.390625 1.171875 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 94.762 95.0 97.806 100.0 100.85 103.894 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 367.458 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.81 2.809 2.697 2.697 2.697 2.81 2.845 2.997 3.141 3.281 3.42 3.558 3.697 3.838 3.981 4.128 4.278 4.432 4.59 4.753 4.922 5.096 5.275 5.461 5.653 5.851 6.056 6.268 6.487 6.712 6.944 7.182 7.427 7.678 7.934 8.196 8.463 8.734 9.01 9.288 9.57 9.854 10.14 10.426 10.713 10.999 11.283 11.564 11.84 12.11 12.372 12.622 12.857 13.073 13.266 13.43 13.559 13.649 13.694 13.7 13.698 13.684 13.656 13.615 13.561 13.497 13.421 13.335 13.24 13.136 13.023 12.904 12.777 12.644 12.505 12.361 12.212 12.059 11.902 11.742 11.579 11.413 11.245 11.076 10.905 10.734 10.561 10.388 10.215 10.041 9.868 9.696 9.524 9.353 9.183 9.014 8.846 8.68 8.515 8.352 8.19 8.031 7.873 7.717 7.563 7.411 7.262 7.114 6.969 6.826 6.685 6.546 6.41 6.275 6.143 6.014 5.886 5.761 5.638 5.517 5.399 5.283 5.168 5.057 4.947 4.839 4.733 4.63 4.528 4.429 4.332 4.236 4.143 4.051 3.961 3.873 3.787 3.703 3.621 3.54 3.461 3.383 3.308 3.234 3.161 3.09 3.021 2.953 2.886 2.821 2.758 2.696 2.635 2.575 2.517 2.46 2.405 2.35 2.297 2.245 2.194 2.144 2.096 2.048 2.002 1.956 1.912 1.868 1.826 1.784 1.744 1.704 1.665 1.627 1.59 1.554 1.519 1.484 1.45 1.417 1.385 1.353 1.322 1.292 1.263 1.234 1.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="94.762" Num="3" Error="1.602">
-7.003 2.906 -0.665
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.81" EndFrequency="13.7" PeakHeight="367.458" Num="5" zHalfNm="277.068" Error="4.338">
-218.213 -54.323 8.382 -1.223 1.813
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="9.132" Depth="0.113"/>
<TopsideChapman PeakHeight="367.458" PeakDensity="2328660.0" PeakScaleHeight="67.491" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
