<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 21:10:00.000"
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 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" >
2026.02.25 (056) 21:10:00</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">
FF202605602252110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="8.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.422" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.554" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="280.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="280.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="440.000" 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="1.186" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="424.637" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="288.922" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.190" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="192.109" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.399" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="101.130" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="180.290" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.580" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.050" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="118">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.05 3.1 3.15 3.2 3.25 3.3 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 291.667 293.333 295.000 296.667 298.333 300.000 300.000 300.000 300.000 300.000 302.500 305.000 306.111 307.222 308.333 309.444 310.556 311.667 312.778 313.889 315.000 320.000 320.000 325.000 325.000 326.250 327.500 328.750 330.000 332.500 335.000 336.000 337.000 338.000 339.000 340.000 340.000 340.000 345.000 345.000 350.000 352.500 355.000 355.000 355.000 358.333 361.667 365.000 365.000 367.500 370.000 370.000 375.000 380.000 385.000 385.000 390.000 390.000 392.500 395.000 400.000 405.000 405.000 410.000 415.000 420.000 420.000 430.000 435.000 435.000 437.500 440.000 450.000 455.000 460.000 465.000 470.000 470.000 475.000 480.000 485.000 495.000 500.000 510.000 515.000 520.000 525.000 535.000 543.640 553.007 563.196 574.321 586.517 599.946 614.806 631.337 649.839 670.686 694.354 721.458 752.805 789.474
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 57 63 63 63 63 0 63 66 63 63 72 69 72 0 0 0 0 0 0 69 69 0 63 0 57 0 0 51 0 0 0 0 0 63 60 60 51 51 0 0 0 60 0 54 0 60 0 0 60 60 57 60 63 72 0 72 57 66 54 0 72 69 0 63 54 63 54 60 54 57 57 0 51 60 63 69 66 69 69 63 57 63 69 0 72 72 72 72 69 66 72 69 63 63 60 51 51 45 60 63 60 0 0 0 0 0 0 0 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 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -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 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 2.734375 -0.390625 2.734375 0.390625 -1.953125 -2.734375 -1.171875 1.171875 -2.734375 1.171875 0.390625 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="15">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 105.000 105.000 105.000 105.000 100.000 101.000 102.000 103.000 104.000 105.000 105.000 105.000 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 0 54 0 0 0 0 0 0 0 0 51 51
</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="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.112 95.0 100.0 105.0 110.0 115.0 120.0 124.055 125.0 130.0 135.0 138.109 140.0 145.0 150.0 152.164 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 424.637 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.791 1.027 1.148 1.186 1.166 1.103 1.016 1.016 1.016 1.016 1.016 1.039 1.099 1.16 1.186 1.242 1.338 1.436 1.538 1.645 1.76 1.885 2.02 2.169 2.333 2.513 2.712 2.927 3.159 3.402 3.653 3.908 4.161 4.41 4.653 4.889 5.118 5.339 5.552 5.758 5.956 6.148 6.333 6.511 6.682 6.848 7.007 7.161 7.308 7.449 7.585 7.714 7.837 7.955 8.066 8.17 8.268 8.36 8.445 8.523 8.594 8.658 8.714 8.764 8.806 8.84 8.867 8.885 8.897 8.9 8.9 8.898 8.891 8.881 8.866 8.848 8.827 8.802 8.773 8.742 8.707 8.67 8.63 8.587 8.542 8.494 8.444 8.392 8.338 8.282 8.224 8.164 8.103 8.04 7.976 7.911 7.845 7.777 7.708 7.639 7.569 7.497 7.426 7.353 7.28 7.207 7.133 7.059 6.984 6.909 6.834 6.759 6.684 6.609 6.534 6.459 6.384 6.309 6.235 6.16 6.086 6.012 5.939 5.865 5.793 5.72 5.648 5.576 5.505 5.435 5.364 5.295 5.226 5.157 5.089 5.021 4.955 4.888 4.822 4.757 4.693 4.629 4.566 4.503 4.441 4.38 4.319 4.259 4.2 4.141 4.083 4.025 3.969 3.912 3.857 3.802 3.748 3.694 3.642 3.589 3.538 3.487 3.436 3.387 3.338 3.289 3.241 3.194 3.148 3.102 3.056 3.011 2.967 2.924 2.881 2.838 2.796 2.755 2.714 2.674 2.635 2.595 2.557 2.519 2.481 2.445

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.186" PeakHeight="110.0" Num="3" Error="0.0">
-27.233 8.813 -1.468
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.186" EndFrequency="8.9" PeakHeight="424.637" Num="5" zHalfNm="288.922" Error="5.757">
-298.816 36.846 -9.448 -3.676 2.621
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="42.164" Depth="0.17"/>
<TopsideChapman PeakHeight="424.637" PeakDensity="982754.3" PeakScaleHeight="101.13" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
