<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-19 -078 12:40:00.000"
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 1 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" >
2026.03.19 (078) 12:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607803191240009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="36" >
<URSI ID="00" Val="9.875" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.252" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.567" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.284" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.300" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="320.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="105.405" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.177" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.260" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="348.604" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="188.494" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="238.576" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.233" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="132.263" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="67.090" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.146" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.482" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="170.720" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.540" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.330" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="4">
<Trace Type="standard" Layer="F2" Polarization="O" Num="92">
<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 9.55 9.6 9.65 9.7 9.75 9.8 9.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
325.000 322.500 320.000 322.500 325.000 325.000 325.000 325.000 320.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 345.000 346.667 348.333 350.000 350.000 352.500 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 372.500 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 425.000 425.000 430.000 435.000 440.000 440.000 445.000 450.000 450.000 450.000 455.000 465.000 465.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 510.000 515.000 520.000 525.000 535.000 543.899 554.062 565.778 579.434 595.554 614.871
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 51 0 51 0 0 51 57 57 60 0 60 60 63 63 63 60 60 60 60 63 63 60 63 66 63 63 66 57 0 0 54 63 48 57 63 66 60 66 57 63 57 63 0 66 60 66 60 66 63 66 66 60 66 63 66 66 63 66 63 60 63 63 57 54 63 60 57 63 63 63 60 60 60 60 60 60 60 57 57 57 57 54 57 54 54 54 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 2.734375 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="18">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 215.000 225.000 225.000 235.000 240.000 250.000 260.000 270.000 280.000 290.000 300.000 305.000 305.000 310.000 310.000 315.000 320.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 51 54 54 51 0 54 51 54 51 54 54 51 48 54 51 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 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.3 3.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.405 109.166
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.4 3.45 3.5 3.55 3.6 3.65
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 105.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 60 60 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
</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" >
89.488 90.0 95.0 100.0 105.0 110.0 112.441 114.882 115.0 117.323 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 188.494 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 348.604 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.26 2.908 3.251 3.36 3.231 3.231 3.237 3.36 3.463 3.628 3.798 3.986 4.179 4.35 4.493 4.614 4.721 4.817 4.908 4.995 5.083 5.18 5.252 5.289 5.418 5.556 5.705 5.866 6.04 6.226 6.423 6.627 6.835 7.041 7.242 7.435 7.62 7.796 7.964 8.125 8.278 8.426 8.568 8.705 8.838 8.967 9.092 9.214 9.332 9.446 9.555 9.656 9.747 9.819 9.865 9.875 9.875 9.869 9.856 9.837 9.811 9.778 9.74 9.697 9.648 9.594 9.535 9.472 9.405 9.334 9.259 9.181 9.1 9.015 8.928 8.839 8.748 8.654 8.559 8.462 8.363 8.264 8.163 8.061 7.958 7.855 7.751 7.647 7.543 7.438 7.333 7.228 7.124 7.019 6.915 6.812 6.708 6.606 6.504 6.402 6.301 6.201 6.102 6.004 5.906 5.81 5.714 5.619 5.525 5.433 5.341 5.251 5.161 5.073 4.985 4.899 4.814 4.73 4.648 4.566 4.486 4.406 4.328 4.251 4.175 4.1 4.027 3.954 3.883 3.813 3.743 3.675 3.608 3.542 3.478 3.414 3.351 3.289 3.229 3.169 3.111 3.053 2.996 2.941 2.886 2.832 2.78 2.728 2.677 2.627 2.577 2.529 2.482 2.435 2.389 2.344 2.3 2.257 2.214 2.172 2.131 2.091 2.052 2.013 1.975 1.937 1.9 1.864 1.829 1.794 1.76 1.727 1.694 1.662 1.63 1.599 1.569 1.539 1.509 1.481 1.452 1.425 1.397 1.371 1.345 1.319 1.294

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.36" PeakHeight="110.0" Num="3" Error="0.0">
-30.479 13.119 -3.152
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.36" EndFrequency="5.252" PeakHeight="188.494" Num="5" Error="0.0">
-56.2 -23.691 13.664 -7.063 2.119
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.252" EndFrequency="9.875" PeakHeight="348.604" Num="5" zHalfNm="238.576" Error="4.793">
-137.221 -28.665 11.895 -7.28 1.161
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.323" Depth="0.129"/>
<TopsideChapman PeakHeight="348.604" PeakDensity="1209871.2" PeakScaleHeight="80.482" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
