<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 14:10:00.000"
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 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" >
2026.02.26 (057) 14:10:00</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">
FF202605702261410009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="9.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.917" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.711" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.350" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.510" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.707" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="93.215" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="5.080" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="422.336" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.365" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.348" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="289.343" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="209.313" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.297" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="96.084" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="29.244" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.873" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="153.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="85">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 295.000 295.000 300.000 300.000 301.250 302.500 303.750 305.000 306.250 307.500 308.750 310.000 310.000 311.111 312.222 313.333 314.444 315.556 316.667 317.778 318.889 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 337.000 339.000 341.000 343.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 355.000 357.500 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 400.000 401.636 403.477 405.565 407.954 410.714 413.937 417.751 422.336 427.951 434.988 444.065 456.217 473.330
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48 48 48 0 0 48 0 0 0 0 51 48 0 0 54 0 0 0 51 0 51 51 51 48 51 48 54 57 0 51 48 60 60 54 0 0 54 0 51 54 60 60 63 66 66 66 51 57 63 66 69 66 69 69 66 69 69 66 69 69 66 66 60 63 54 60 63 60 63 54 60 54 66 57 69 57 45 57 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 0.390625 1.953125 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 -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 -0.390625 -0.390625 1.171875 2.734375 1.953125 0.390625 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.35 3.4 3.45 3.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.707 98.369 100.644 104.395
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 57 60 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.55 3.6 3.65 3.7 3.75 3.8 3.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 100.000 101.250 102.500 103.750 105.000 100.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 57 0 0 0 51 54
</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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
87.998 90.0 93.215 94.869 95.0 96.522 98.176 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 289.343 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.728 3.51 3.382 3.382 3.382 3.51 3.596 3.79 3.954 4.104 4.246 4.382 4.515 4.646 4.775 4.904 5.033 5.163 5.293 5.426 5.56 5.696 5.835 5.976 6.121 6.27 6.422 6.579 6.74 6.906 7.078 7.256 7.439 7.629 7.826 8.028 8.236 8.448 8.661 8.87 9.069 9.245 9.386 9.474 9.5 9.5 9.492 9.471 9.438 9.394 9.34 9.276 9.204 9.123 9.034 8.939 8.837 8.73 8.617 8.5 8.379 8.255 8.127 7.997 7.865 7.731 7.596 7.459 7.322 7.185 7.047 6.909 6.772 6.635 6.499 6.364 6.229 6.096 5.965 5.834 5.706 5.578 5.453 5.329 5.207 5.088 4.97 4.853 4.739 4.627 4.517 4.409 4.304 4.2 4.098 3.998 3.901 3.805 3.711 3.62 3.53 3.442 3.357 3.273 3.191 3.111 3.032 2.956 2.881 2.808 2.737 2.668 2.6 2.534 2.469 2.406 2.344 2.284 2.226 2.169 2.113 2.058 2.005 1.954 1.903 1.854 1.806 1.76 1.714 1.67 1.627 1.584 1.543 1.503 1.464 1.426 1.389 1.353 1.318 1.284 1.25 1.218 1.186 1.155 1.125 1.096 1.067 1.039 1.012 0.986 0.96 0.935 0.911 0.887 0.864 0.841 0.819 0.798 0.777 0.757 0.737 0.718 0.699 0.681 0.663 0.645 0.629 0.612 0.596 0.58 0.565 0.551 0.536 0.522 0.508 0.495 0.482 0.47 0.457 0.445 0.434 0.422 0.411 0.4 0.39 0.38 0.37 0.36

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.51" PeakHeight="93.215" Num="3" Error="0.39">
-7.769 3.372 -0.82
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.51" EndFrequency="9.5" PeakHeight="289.343" Num="5" zHalfNm="209.313" Error="3.932">
-147.37 -57.412 10.291 3.35 -0.026
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.961" Depth="0.128"/>
<TopsideChapman PeakHeight="289.343" PeakDensity="1119727.0" PeakScaleHeight="58.873" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
