<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-31 -031 22:00:00.000"
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 0 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x cusp, F2 cusps do not match</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) 22:00:00</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">
FF202603101312200009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.390" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.804" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="360.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="360.000" 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="6.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="536.042" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="0.417" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="466.316" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="383.878" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.007" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="119.748" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.313" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="62.658" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="121.210" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.910" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="116">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
365.000 360.000 360.833 361.667 362.500 363.333 364.167 365.000 365.000 375.000 370.000 370.000 370.000 375.000 375.556 376.111 376.667 377.222 377.778 378.333 378.889 379.444 380.000 385.000 386.111 387.222 388.333 389.444 390.556 391.667 392.778 393.889 395.000 395.000 397.500 400.000 395.000 397.000 399.000 401.000 403.000 405.000 405.000 405.000 410.000 410.909 411.818 412.727 413.636 414.545 415.455 416.364 417.273 418.182 419.091 420.000 425.000 427.000 429.000 431.000 433.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 445.000 450.000 450.000 450.000 455.000 455.000 458.333 461.667 465.000 465.000 465.000 467.000 469.000 471.000 473.000 475.000 480.000 482.000 484.000 486.000 488.000 490.000 490.000 493.000 496.000 499.000 502.000 505.000 508.000 511.000 514.000 517.000 520.000 524.867 530.192 536.042 542.501 549.667 557.665 566.647 576.807 588.393 601.728 617.240 635.511 657.346 683.904
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 0 0 0 0 0 60 63 0 69 0 63 57 0 0 0 0 0 0 0 0 72 66 0 0 0 0 0 0 0 0 63 69 0 60 69 0 0 69 0 66 54 66 57 0 0 0 0 66 0 0 0 0 0 0 66 0 0 0 0 60 63 54 69 0 69 66 60 0 57 0 0 57 0 0 0 48 60 57 0 0 51 0 66 63 0 0 0 0 63 0 0 0 0 0 0 0 63 0 0 60 60 51 0 0 0 0 0 0 0 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-2.734375 -0.390625 -0.390625 -1.953125 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 -0.390625 -1.171875 -1.953125 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 1.953125 -1.171875 1.953125 -1.953125 2.734375 -2.734375 -1.171875 0.390625 -0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
92.446 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.069 140.0 145.0 150.0 155.0 160.0 165.0 168.139 170.0 175.0 180.0 185.0 190.0 195.0 197.208 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 466.316 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.276 0.361 0.404 0.417 0.412 0.398 0.372 0.332 0.273 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.251 0.289 0.326 0.363 0.401 0.417 0.448 0.503 0.557 0.613 0.669 0.727 0.788 0.851 0.916 0.985 1.057 1.132 1.212 1.295 1.384 1.477 1.575 1.679 1.789 1.906 2.03 2.161 2.299 2.446 2.602 2.766 2.94 3.122 3.314 3.514 3.723 3.94 4.163 4.391 4.622 4.856 5.089 5.319 5.546 5.766 5.977 6.179 6.369 6.546 6.709 6.858 6.99 7.107 7.207 7.29 7.356 7.405 7.436 7.449 7.45 7.448 7.436 7.417 7.389 7.354 7.312 7.264 7.209 7.149 7.083 7.013 6.938 6.86 6.778 6.692 6.604 6.513 6.42 6.325 6.229 6.131 6.032 5.932 5.831 5.73 5.629 5.527 5.426 5.325 5.224 5.123 5.023 4.924 4.826 4.728 4.632 4.536 4.442 4.348 4.256 4.165 4.076 3.987 3.901 3.815 3.731 3.648 3.566 3.486 3.408 3.331 3.255 3.181 3.108 3.036 2.966 2.898 2.83 2.764 2.7 2.636 2.575 2.514 2.455 2.397 2.34 2.284 2.23 2.177 2.125 2.074 2.025 1.976 1.929 1.882 1.837 1.793 1.75 1.707 1.666 1.626 1.586 1.548 1.51 1.474 1.438 1.403 1.369 1.336 1.303 1.271 1.24 1.21 1.181 1.152 1.124 1.096 1.069 1.043 1.018 0.993 0.969 0.945 0.922 0.899 0.877 0.856

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.417" PeakHeight="110.0" Num="3" Error="0.0">
-20.647 3.342 -0.249
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.417" EndFrequency="7.45" PeakHeight="466.316" Num="5" zHalfNm="383.878" Error="4.01">
-253.94 -17.15 -3.466 6.003 -0.555
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.208" Depth="0.217"/>
<TopsideChapman PeakHeight="466.316" PeakDensity="688616.6" PeakScaleHeight="62.658" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
