<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 15:10:00.000"
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="2 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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) 15:10:00</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">
FF202605902281510009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="11.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.529" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.101" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.200" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" 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="3.404" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.367" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="372.196" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="266.321" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.532" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="140.192" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="60.096" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="78.321" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="176.730" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.340" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="134">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 280.000 285.000 290.000 295.000 305.000 305.000 310.000 315.000 320.000 320.000 321.667 323.333 325.000 326.667 328.333 330.000 330.000 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 365.000 370.000 370.000 370.000 370.000 370.000 372.500 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 442.500 445.000 445.000 445.000 450.000 450.000 450.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 470.000 470.000 475.000 480.000 480.000 480.000 485.000 490.000 500.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 536.261 543.115 550.650 558.973 568.215 578.535 590.136 603.271 618.267 635.547
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 51 51 54 45 51 0 54 51 54 0 51 0 51 0 51 48 48 0 0 48 48 51 54 51 51 54 57 60 60 60 60 63 63 60 54 60 60 57 54 60 57 60 54 0 60 54 48 0 48 54 60 60 60 0 60 60 60 63 63 60 63 63 60 63 51 57 63 51 57 60 54 60 63 66 60 48 54 60 51 54 60 51 57 42 63 57 0 63 51 60 48 57 0 51 0 57 45 0 57 54 54 48 51 45 51 45 51 48 54 51 54 54 51 51 45 51 51 51 51 51 51 51 48 0 45 48 48 48 0 0 45 45
</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 -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 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
</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" >
89.481 90.0 95.0 100.0 105.0 110.0 111.493 112.986 114.479 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 372.196 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.29 2.946 3.293 3.404 3.281 3.281 3.404 3.423 3.595 3.749 3.896 4.037 4.177 4.315 4.454 4.593 4.733 4.876 5.02 5.167 5.317 5.47 5.626 5.786 5.949 6.115 6.285 6.459 6.636 6.816 7.0 7.187 7.376 7.569 7.764 7.961 8.16 8.361 8.564 8.767 8.972 9.177 9.382 9.587 9.792 9.995 10.196 10.394 10.589 10.78 10.964 11.14 11.306 11.459 11.595 11.711 11.802 11.865 11.897 11.9 11.899 11.889 11.87 11.843 11.808 11.765 11.714 11.657 11.593 11.523 11.448 11.366 11.28 11.189 11.094 10.994 10.891 10.784 10.674 10.561 10.446 10.328 10.208 10.087 9.963 9.838 9.712 9.585 9.457 9.329 9.199 9.07 8.94 8.811 8.681 8.552 8.422 8.294 8.165 8.038 7.911 7.785 7.659 7.535 7.412 7.289 7.168 7.048 6.929 6.811 6.695 6.58 6.466 6.353 6.242 6.133 6.024 5.917 5.812 5.708 5.605 5.504 5.405 5.306 5.21 5.114 5.021 4.928 4.837 4.748 4.66 4.573 4.488 4.404 4.321 4.24 4.16 4.082 4.005 3.929 3.855 3.781 3.71 3.639 3.57 3.501 3.434 3.369 3.304 3.241 3.178 3.117 3.057 2.998 2.94 2.884 2.828 2.773 2.72 2.667 2.615 2.564 2.515 2.466 2.418 2.371 2.325 2.279 2.235 2.191 2.149 2.107 2.065 2.025 1.986 1.947 1.909 1.871 1.835 1.799 1.763 1.729 1.695 1.662 1.629 1.597

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.404" PeakHeight="110.0" Num="3" Error="0.0">
-30.51 13.165 -3.174
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.404" EndFrequency="11.9" PeakHeight="372.196" Num="5" zHalfNm="266.321" Error="4.833">
-216.316 -53.28 11.497 -1.296 1.678
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.479" Depth="0.123"/>
<TopsideChapman PeakHeight="372.196" PeakDensity="1756947.9" PeakScaleHeight="78.321" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
