<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 06:10:00.000"
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: 95% PACIFIC flags: Multiple candidates for F2x cusp</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" >
2026.02.28 (059) 06:10:00</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">
FF202605902280610009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="6.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.357" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.164" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.200" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="302.431" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="278.856" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="230.826" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.754" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="67.903" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.754" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="36.324" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="55.400" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="4.480" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.350" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="92">
<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 2.85 2.9 2.95 3.0 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 220.000 220.000 220.000 220.000 221.667 223.333 225.000 226.667 228.333 230.000 230.000 230.000 230.000 225.000 225.000 225.000 226.667 228.333 230.000 230.000 230.000 230.000 231.250 232.500 233.750 235.000 235.000 235.000 236.667 238.333 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 242.000 244.000 246.000 248.000 250.000 250.000 250.000 250.000 252.500 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 265.000 265.000 266.667 268.333 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 280.000 280.000 280.000 285.000 290.000 295.000 295.000 297.177 299.634 302.431 305.643 309.370 313.745 318.955 325.264 333.059 342.937 355.862 373.499 399.000 439.135
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 72 69 69 75 0 0 0 0 0 63 66 0 63 0 72 0 0 0 72 75 75 75 0 0 0 78 81 81 0 0 69 0 0 0 51 0 66 0 75 0 0 0 60 0 69 0 69 72 66 66 66 0 0 0 72 69 69 69 60 66 0 0 60 0 69 0 75 66 72 69 66 72 69 0 0 54 63 72 66 0 72 63 0 66 69 72 69 66 63 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 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="39">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.3 1.35 1.4 1.45 1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.85 1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 114.000 113.000 112.000 111.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.714 111.429 112.143 112.857 113.571 114.286 115.000 115.714 116.429 117.143 117.857 118.571 119.286 120.000 120.000 120.000 120.000 115.000 115.000 110.000 125.000 125.000 126.667 128.333 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 63 63 60 0 66 0 0 0 69 0 63 0 51 0 0 0 0 0 0 0 0 0 54 0 0 57 57 51 54 0 51 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.171875 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 1.171875 0.390625 0.390625 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="136">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 135.667 140.0 145.0 150.0 155.0 160.0 161.333 165.0 170.0 175.0 180.0 185.0 187.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 278.856 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.349 0.335 0.31 0.271 0.21 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.252 0.282 0.312 0.342 0.354 0.414 0.544 0.73 1.023 1.533 2.415 3.4 4.184 4.792 5.276 5.67 5.992 6.255 6.467 6.633 6.757 6.842 6.889 6.9 6.899 6.881 6.841 6.779 6.7 6.604 6.495 6.373 6.242 6.101 5.954 5.802 5.646 5.486 5.325 5.163 5.001 4.84 4.68 4.521 4.365 4.212 4.061 3.914 3.77 3.63 3.494 3.361 3.232 3.107 2.986 2.87 2.756 2.647 2.542 2.44 2.342 2.247 2.156 2.069 1.984 1.903 1.825 1.75 1.678 1.609 1.543 1.479 1.418 1.359 1.302 1.248 1.196 1.147 1.099 1.053 1.009 0.967 0.926 0.888 0.85 0.815 0.781 0.748 0.717 0.686 0.658 0.63 0.604 0.578 0.554 0.531 0.508 0.487 0.467 0.447 0.428 0.41 0.393 0.376 0.361 0.345 0.331 0.317 0.304 0.291 0.279 0.267 0.256 0.245 0.235 0.225 0.215 0.206

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="6.9" PeakHeight="278.856" Num="5" zHalfNm="230.826" Error="1.057">
-113.062 34.502 -16.2 3.117 -0.213
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="77.0" Depth="0.154"/>
<TopsideChapman PeakHeight="278.856" PeakDensity="590694.8" PeakScaleHeight="36.324" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
