<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-11 -070 12:50:00.000"
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 1 0 0 0 0 0 22 0 0 0 0 0 0 0 0 1 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" >
2026.03.11 (070) 12:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.16" 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">
FF202607003111250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="9.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.273" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.860" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.025" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.500" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="431.877" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.203" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.273" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="300.402" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="182.439" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="223.295" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.262" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.250" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="81.958" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="59.653" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="27.563" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.968" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="135.170" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.150" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.240" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="79">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 316.667 318.333 320.000 320.000 320.000 330.000 330.000 330.000 325.000 325.000 328.333 331.667 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 360.000 362.500 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 407.500 410.000 415.000 416.380 417.904 419.595 421.481 423.600 425.997 428.731 431.877 435.537 439.848 445.000 451.267 459.053 468.988
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 51 54 60 57 57 0 63 0 54 0 60 48 0 0 57 57 51 0 57 60 54 0 0 0 63 66 63 66 69 60 0 66 57 60 66 63 63 54 57 48 54 54 66 63 72 63 60 48 54 66 63 63 0 48 60 57 60 66 69 48 66 57 57 57 57 60 54 45 51 57 60 57 54 45 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 -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 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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" >
260.000 267.500 275.000 280.000 283.000 286.000 289.000 292.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 45 48 0 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 57 57 63 63 48 0 0 0 0 0 63 57
</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
</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" >
89.512 90.0 95.0 100.0 105.0 110.0 112.329 114.659 115.0 116.988 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.439 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 300.402 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.154 2.772 3.099 3.203 3.081 3.081 3.099 3.203 3.342 3.564 3.79 4.009 4.204 4.374 4.523 4.658 4.782 4.9 5.015 5.13 5.243 5.273 5.342 5.482 5.631 5.792 5.963 6.147 6.341 6.544 6.754 6.966 7.178 7.386 7.589 7.786 7.977 8.163 8.344 8.522 8.697 8.87 9.042 9.21 9.364 9.449 9.45 9.444 9.424 9.391 9.345 9.288 9.221 9.144 9.058 8.963 8.862 8.753 8.639 8.519 8.394 8.266 8.134 7.999 7.861 7.721 7.58 7.437 7.294 7.15 7.006 6.862 6.718 6.575 6.433 6.291 6.151 6.013 5.875 5.74 5.606 5.474 5.344 5.216 5.09 4.966 4.844 4.724 4.607 4.492 4.379 4.268 4.16 4.054 3.95 3.849 3.749 3.652 3.557 3.465 3.374 3.285 3.199 3.115 3.032 2.952 2.874 2.797 2.723 2.65 2.579 2.51 2.443 2.377 2.313 2.251 2.19 2.131 2.073 2.017 1.963 1.909 1.858 1.807 1.758 1.71 1.664 1.618 1.574 1.531 1.49 1.449 1.409 1.371 1.334 1.297 1.262 1.227 1.193 1.161 1.129 1.098 1.068 1.039 1.01 0.983 0.956 0.929 0.904 0.879 0.855 0.831 0.809 0.786 0.765 0.744 0.723 0.704 0.684 0.665 0.647 0.629 0.612 0.595 0.579 0.563 0.547 0.532 0.518 0.504 0.49 0.476 0.463 0.45 0.438 0.426 0.414 0.403 0.392 0.381 0.37 0.36 0.35 0.341 0.331 0.322 0.313

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.203" PeakHeight="110.0" Num="3" Error="0.0">
-30.36 12.944 -3.072
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.203" EndFrequency="5.273" PeakHeight="182.439" Num="5" Error="0.0">
-54.224 -18.22 10.32 -4.309 0.982
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.273" EndFrequency="9.45" PeakHeight="300.402" Num="5" zHalfNm="223.295" Error="8.186">
-88.328 -34.631 8.926 -4.705 0.775
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.988" Depth="0.122"/>
<TopsideChapman PeakHeight="300.402" PeakDensity="1107971.5" PeakScaleHeight="55.968" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
