<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 13:20:00.000"
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 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" >
2026.01.31 (031) 13:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202603101311320009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="9.175" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.323" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.417" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.112" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="315.000" Name="h`F2" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" 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="3.243" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.292" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="375.931" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="184.958" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="235.772" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.777" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="166.143" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="65.756" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="45.756" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="102.421" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="228.410" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="77">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 315.000 320.000 325.000 330.000 335.000 340.000 340.000 345.000 350.000 355.000 355.000 356.667 358.333 360.000 360.000 365.000 370.000 370.000 370.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 420.000 425.000 430.000 430.000 440.000 440.000 445.000 450.000 455.000 460.000 460.000 470.000 475.000 480.000 485.000 490.000 500.000 505.000 515.000 525.000 530.000 545.000 550.000 560.000 568.333 576.667 585.000 590.000 600.000 605.000 615.000 624.384 634.656 645.949 658.423 672.274 687.742 705.129
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 48 51 51 0 51 54 51 57 0 0 57 48 57 57 57 54 60 54 60 60 60 60 54 57 57 60 57 63 57 63 57 60 63 57 63 57 60 57 54 51 57 57 51 54 57 57 54 51 51 54 57 60 60 60 57 54 51 48 45 45 0 45 45 45 45 48 51 48 48 42 45 42 42
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 230.000 239.000 248.000 257.000 266.000 275.000 280.000 287.000 294.000 301.000 308.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 45 51 48 0 0 0 51 48 0 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.171875 0.390625 0.390625 1.171875 2.734375 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" >
89.506 90.0 95.0 100.0 105.0 110.0 112.161 114.321 115.0 116.482 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.958 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 375.931 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.181 2.807 3.137 3.243 3.121 3.121 3.159 3.243 3.408 3.614 3.822 4.031 4.231 4.412 4.572 4.716 4.847 4.968 5.081 5.187 5.279 5.323 5.324 5.459 5.573 5.68 5.784 5.888 5.995 6.104 6.219 6.34 6.467 6.602 6.743 6.888 7.034 7.178 7.318 7.451 7.577 7.695 7.806 7.911 8.011 8.106 8.196 8.283 8.367 8.448 8.527 8.604 8.679 8.753 8.825 8.897 8.967 9.034 9.097 9.148 9.174 9.175 9.174 9.168 9.159 9.145 9.128 9.107 9.083 9.055 9.024 8.99 8.953 8.914 8.871 8.826 8.779 8.729 8.677 8.622 8.566 8.508 8.449 8.387 8.324 8.26 8.194 8.127 8.059 7.99 7.92 7.848 7.777 7.704 7.631 7.557 7.482 7.407 7.332 7.256 7.18 7.104 7.028 6.952 6.875 6.799 6.722 6.646 6.57 6.493 6.418 6.342 6.266 6.191 6.116 6.042 5.968 5.894 5.821 5.748 5.675 5.603 5.532 5.461 5.391 5.321 5.251 5.183 5.115 5.047 4.98 4.914 4.848 4.783 4.718 4.654 4.591 4.529 4.467 4.405 4.345 4.285 4.226 4.167 4.109 4.052 3.995 3.939 3.883 3.829 3.775 3.721 3.668 3.616 3.565 3.514 3.464 3.414 3.365 3.317 3.269 3.222 3.175 3.129 3.084 3.039 2.995 2.952 2.909 2.866 2.825 2.783 2.743 2.703 2.663 2.624 2.585 2.547 2.51 2.473 2.437 2.401 2.365 2.33 2.296 2.262 2.228

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.243" PeakHeight="110.0" Num="3" Error="0.0">
-30.391 12.99 -3.093
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.243" EndFrequency="5.323" PeakHeight="184.958" Num="5" Error="0.0">
-60.163 -13.269 7.193 -3.243 1.006
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.323" EndFrequency="9.175" PeakHeight="375.931" Num="5" zHalfNm="235.772" Error="3.989">
-158.944 -43.825 19.465 -12.852 5.183
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.482" Depth="0.122"/>
<TopsideChapman PeakHeight="375.931" PeakDensity="1044424.6" PeakScaleHeight="102.421" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
