<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-27 -027 17:00:00.000"
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" >
2026.01.27 (027) 17:00:00</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">
FF202602701271700009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="30" >
<URSI ID="00" Val="8.925" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.473" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.476" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.034" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="180.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" 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="4.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="180.000" 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="3.238" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.289" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="364.276" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="187.937" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="229.089" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.989" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="152.584" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="80.727" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="41.927" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="99.017" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="223.500" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.210" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="69">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 340.000 340.000 347.500 355.000 355.000 362.500 370.000 370.000 375.000 375.000 380.000 382.500 385.000 387.500 390.000 390.000 390.000 392.500 395.000 400.000 400.000 400.000 403.750 407.500 411.250 415.000 420.000 420.000 425.000 427.500 430.000 430.000 435.000 440.000 440.000 445.000 450.000 450.000 455.000 455.000 455.000 465.000 470.000 470.000 475.000 485.000 490.000 490.000 495.000 500.000 505.000 515.000 520.000 530.000 535.000 545.000 555.000 565.000 570.000 580.000 590.000 601.374 614.166 628.657 645.212 664.303 686.563
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 63 60 48 0 54 51 0 45 54 48 0 51 0 54 0 51 57 51 0 51 51 51 48 0 0 0 57 51 57 51 0 48 57 54 51 60 57 45 54 51 60 60 57 54 57 57 48 48 57 60 60 63 63 60 63 57 57 54 54 51 54 54 48 45 48 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 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 -0.390625 1.171875 -0.390625 -1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="22">
<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 5.3 5.35 5.4 5.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
180.000 180.000 185.000 180.000 187.500 195.000 202.500 210.000 220.000 230.000 240.000 250.000 260.000 270.000 280.000 290.000 300.000 305.000 312.500 320.000 325.000 330.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 54 54 57 0 0 0 51 0 0 0 0 0 0 0 0 48 45 0 51 48 54
</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 1.953125 2.734375 2.734375 1.953125 1.171875 -0.390625 -2.734375 -0.390625 0.390625 -0.390625 0.390625 1.953125 -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" >
89.507 90.0 95.0 100.0 105.0 110.0 112.183 114.366 115.0 116.549 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 187.937 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 364.276 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.178 2.802 3.133 3.238 3.116 3.116 3.151 3.238 3.396 3.614 3.939 4.341 4.567 4.719 4.84 4.943 5.035 5.121 5.203 5.284 5.365 5.445 5.473 5.524 5.634 5.735 5.832 5.928 6.025 6.123 6.225 6.331 6.441 6.557 6.679 6.806 6.937 7.071 7.205 7.337 7.465 7.588 7.705 7.816 7.921 8.022 8.118 8.21 8.298 8.383 8.465 8.544 8.62 8.693 8.762 8.825 8.878 8.914 8.925 8.925 8.922 8.915 8.904 8.889 8.869 8.847 8.82 8.79 8.757 8.721 8.682 8.64 8.595 8.548 8.498 8.446 8.392 8.335 8.277 8.217 8.155 8.092 8.027 7.96 7.893 7.824 7.754 7.683 7.611 7.539 7.465 7.391 7.317 7.242 7.166 7.09 7.014 6.937 6.861 6.784 6.707 6.63 6.553 6.476 6.399 6.323 6.246 6.17 6.094 6.019 5.943 5.868 5.794 5.72 5.646 5.573 5.5 5.428 5.356 5.285 5.214 5.144 5.075 5.006 4.938 4.87 4.803 4.737 4.671 4.606 4.541 4.478 4.415 4.352 4.29 4.229 4.169 4.109 4.05 3.992 3.934 3.877 3.821 3.766 3.711 3.656 3.603 3.55 3.498 3.446 3.395 3.345 3.296 3.247 3.198 3.151 3.104 3.057 3.012 2.966 2.922 2.878 2.835 2.792 2.75 2.708 2.667 2.627 2.587 2.548 2.509 2.471 2.434 2.396 2.36 2.324 2.289 2.254 2.219 2.185 2.152 2.119 2.086 2.054 2.023 1.992 1.961

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.238" PeakHeight="110.0" Num="3" Error="0.0">
-30.387 12.984 -3.09
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.238" EndFrequency="5.473" PeakHeight="187.937" Num="5" Error="0.0">
-66.325 -12.349 14.469 -10.377 3.194
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.473" EndFrequency="8.925" PeakHeight="364.276" Num="5" zHalfNm="229.089" Error="4.797">
-144.841 -37.892 10.583 -7.817 3.628
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.549" Depth="0.122"/>
<TopsideChapman PeakHeight="364.276" PeakDensity="988283.2" PeakScaleHeight="99.017" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
