<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-25 -084 11:30:00.000"
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 8 0 0 0 0 0 0 0 55 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44: Problems inverting F-trace to N(h)-profile</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" >
2026.03.25 (084) 11:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608403251130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.360" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="34.100" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.350" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="125.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="125.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="106.276" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="101.419" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="11.183" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="320.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.877" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.147" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.750" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="32" Val="6.400" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="76">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 125.000 125.000 145.714 166.429 187.143 207.857 228.571 249.286 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 277.500 280.000 282.500 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 292.500 295.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 315.000 315.000 320.000 320.000 320.000 330.000 332.603 335.846 340.000 345.511 353.173 364.552 383.218 419.468
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 66 45 66 0 0 0 0 0 0 69 66 66 66 60 60 63 66 66 69 69 69 72 72 72 72 72 72 75 72 72 75 75 63 0 0 0 69 75 75 75 75 66 0 69 0 72 57 66 69 69 69 63 66 72 57 60 66 69 69 66 69 66 69 66 72 72 66 63 69 69 66 66 60 57 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 1.171875 1.953125 2.734375 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
106.276 106.970 107.712 108.510 109.371 110.308 111.334 112.468 113.737 115.180
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 0 54 0 0 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.953125 -0.390625 -0.390625 2.734375 -0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="57">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
135.000 135.000 135.000 135.000 135.000 135.000 135.000 135.000 135.000 125.000 125.000 125.000 125.000 125.000 130.000 129.000 128.000 127.000 126.000 125.000 125.000 125.000 125.000 125.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 57 0 0 0 0 0 0 72 63 60 0 63 63 0 0 0 0 51 54 0 0 60 57 0 0 48 0 54 0 66 66 57 60 0 69 60 0 0 0 0 0 0 0 0 0 0 69 66 66 0 0 66 66 0 66
</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 -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 -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 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="14">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 90.0 91.0 92.0 93.0 94.0 95.0 96.0 97.0 98.0 99.0 100.0 101.0 101.419
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.20000996 1.0983092 1.5736628 1.8798796 2.1151915 2.3039484 2.4565299 2.5784452 2.672896 2.7418914 2.786679 2.8079703 2.81

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="1" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="101.419" Num="3" Error="3.932">
-16.79 6.966 -1.595
</ShiftedChebyshev>
</ShiftedChebyshevList>
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
