<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-10-10 -283 23:00:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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" >
2026.10.10 (283) 23:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.38" 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">
FF202628310102300009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="11.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.561" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.605" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.300" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.650" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="521.725" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="442.282" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.664" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.919" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="99.777" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="38.390" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.745" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="101.180" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.840" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="154">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 360.000 360.833 361.667 362.500 363.333 364.167 365.000 365.000 365.000 365.000 365.000 365.000 365.714 366.429 367.143 367.857 368.571 369.286 370.000 370.000 370.000 373.333 376.667 380.000 383.333 386.667 390.000 393.333 396.667 400.000 400.000 400.000 400.000 400.000 400.000 400.000 398.750 397.500 396.250 395.000 395.000 395.000 398.333 401.667 405.000 400.000 400.000 400.000 400.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 395.000 396.382 397.763 399.145 400.526 401.908 403.289 404.671 406.053 407.434 408.816 410.197 411.579 412.961 414.342 415.724 417.105 418.487 419.868 421.250 422.632 424.013 425.395 426.776 428.158 429.539 430.921 432.303 433.684 435.066 436.447 437.829 439.211 440.592 441.974 443.355 444.737 446.118 447.500 448.882 450.263 451.645 453.026 454.408 455.789 457.171 458.553 459.934 461.316 462.697 464.079 465.461 466.842 468.224 469.605 470.987 472.368 473.750 475.132 476.513 477.895 479.276 480.658 482.039 483.421 484.803 486.184 487.566 488.947 490.329 491.711 493.092 494.474 495.855 497.237 498.618 500.000 500.000 500.000 502.500 505.000 510.000 507.500 509.371 511.592 514.273 517.570 521.725 527.124 534.422 544.836 560.902 588.938 650.257
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 60 0 0 0 0 0 66 0 0 0 0 0 0 0 66 0 0 0 69 69 0 0 0 0 0 0 0 0 0 0 69 0 0 75 81 72 0 0 0 66 75 0 0 0 0 72 0 69 69 78 0 0 0 84 72 0 0 75 0 0 0 0 0 81 0 0 66 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 54 57 0 63 54 57 69 60 60 63 54 45 60 57 60 51 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -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 1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 -0.390625 0.390625 -0.390625 1.171875 -1.171875 -1.171875 2.734375 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 2.734375 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -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
</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" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.664 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.327 180.0 185.0 190.0 195.0 200.0 205.0 210.0 213.991 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 442.282 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.331 0.311 0.285 0.248 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.225 0.247 0.27 0.292 0.314 0.336 0.354 0.367 0.434 0.512 0.6 0.699 0.811 0.935 1.072 1.222 1.386 1.563 1.754 1.958 2.176 2.407 2.652 2.909 3.179 3.462 3.757 4.065 4.384 4.715 5.056 5.408 5.77 6.14 6.518 6.903 7.293 7.686 8.082 8.476 8.868 9.254 9.63 9.993 10.339 10.663 10.961 11.228 11.46 11.65 11.797 11.896 11.945 11.95 11.947 11.924 11.881 11.818 11.738 11.642 11.531 11.407 11.271 11.124 10.967 10.801 10.629 10.45 10.265 10.076 9.883 9.687 9.489 9.29 9.089 8.888 8.687 8.487 8.287 8.089 7.892 7.698 7.505 7.315 7.128 6.943 6.762 6.583 6.408 6.236 6.067 5.901 5.739 5.581 5.426 5.274 5.126 4.982 4.84 4.703 4.568 4.437 4.31 4.185 4.064 3.946 3.831 3.719 3.611 3.505 3.402 3.302 3.204 3.11 3.018 2.928 2.841 2.757 2.675 2.595 2.518 2.443 2.37 2.299 2.23 2.163 2.099 2.036 1.975 1.915 1.858 1.802 1.748 1.695 1.644 1.595 1.547 1.5 1.455 1.411 1.368 1.327 1.287 1.248 1.21 1.174 1.138 1.104 1.071 1.038 1.007 0.976 0.947 0.918 0.89 0.863 0.837 0.812 0.787 0.764 0.74 0.718 0.696 0.675 0.655 0.635

</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="11.95" PeakHeight="442.282" Num="5" zHalfNm="374.664" Error="1.699">
-224.76 -10.015 9.0 -2.953 0.437
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="103.991" Depth="0.154"/>
<TopsideChapman PeakHeight="442.282" PeakDensity="1771743.1" PeakScaleHeight="50.745" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
