<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 21:50:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.03.28 (087) 21:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608703282150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.582" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.945" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" 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="8.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="497.237" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.381" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.100" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.100" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="422.678" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="367.885" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.939" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="81.329" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="16.115" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="41.359" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="88.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="131">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 360.000 350.000 355.000 355.000 350.000 350.000 351.667 353.333 355.000 356.667 358.333 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.000 370.000 371.667 373.333 375.000 370.000 370.714 371.429 372.143 372.857 373.571 374.286 375.000 380.000 381.000 382.000 383.000 384.000 385.000 385.667 386.333 387.000 387.667 388.333 389.000 389.667 390.333 391.000 391.667 392.333 393.000 393.667 394.333 395.000 395.000 395.000 396.667 398.333 400.000 402.500 405.000 410.000 410.000 410.000 410.000 410.000 410.000 411.667 413.333 415.000 415.000 415.000 417.500 420.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 431.667 433.333 435.000 440.000 441.250 442.500 443.750 445.000 445.000 445.000 450.000 451.250 452.500 453.750 455.000 455.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 470.000 475.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 492.088 494.477 497.237 500.460 504.274 508.859 514.474 521.511 530.587 542.740 559.852
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 57 66 69 72 63 57 0 0 0 0 0 0 0 0 66 60 0 63 51 60 63 69 0 0 0 66 0 0 57 0 0 0 0 0 0 0 51 57 0 0 51 0 69 75 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 54 0 63 48 54 57 60 0 51 0 0 72 72 0 0 66 54 60 0 0 72 63 0 0 69 0 0 66 54 0 0 0 60 63 66 60 0 0 0 66 69 63 69 0 69 69 72 72 72 66 69 69 69 72 66 72 63 72 60 69 60 45 0 0 0 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 -1.171875 -1.953125 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 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 -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 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 0.390625 -0.390625 -1.953125 -0.390625 -0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="184">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
92.978 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.591 140.0 145.0 150.0 155.0 160.0 165.0 169.183 170.0 175.0 180.0 185.0 190.0 195.0 198.774 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 422.678 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.252 0.33 0.369 0.381 0.377 0.365 0.344 0.312 0.265 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.205 0.236 0.266 0.297 0.327 0.358 0.381 0.401 0.474 0.544 0.614 0.686 0.76 0.838 0.92 1.006 1.097 1.193 1.296 1.404 1.519 1.642 1.771 1.909 2.056 2.211 2.375 2.55 2.735 2.93 3.137 3.355 3.585 3.826 4.08 4.345 4.621 4.909 5.207 5.513 5.827 6.146 6.466 6.784 7.095 7.393 7.672 7.923 8.138 8.309 8.429 8.491 8.5 8.497 8.475 8.431 8.367 8.286 8.189 8.077 7.953 7.819 7.675 7.523 7.365 7.201 7.033 6.862 6.689 6.514 6.339 6.163 5.988 5.815 5.643 5.473 5.305 5.14 4.978 4.819 4.663 4.511 4.362 4.217 4.075 3.938 3.804 3.673 3.547 3.424 3.304 3.189 3.076 2.968 2.863 2.761 2.663 2.567 2.475 2.386 2.3 2.217 2.137 2.06 1.985 1.913 1.843 1.776 1.711 1.649 1.588 1.53 1.474 1.42 1.368 1.318 1.269 1.222 1.177 1.134 1.092 1.052 1.013 0.976 0.94 0.905 0.872 0.84 0.809 0.779 0.75 0.722 0.695 0.67 0.645 0.621 0.598 0.576 0.555 0.534 0.514 0.495 0.477 0.459 0.442 0.426 0.41 0.395 0.38 0.366 0.353 0.34 0.327 0.315 0.303 0.292 0.281 0.271 0.261 0.251 0.242 0.233 0.224 0.216 0.208 0.2

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.381" PeakHeight="110.0" Num="3" Error="0.0">
-19.675 2.84 -0.187
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.381" EndFrequency="8.5" PeakHeight="422.678" Num="5" zHalfNm="367.885" Error="3.512">
-196.868 -39.388 10.959 0.931 0.462
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="88.774" Depth="0.181"/>
<TopsideChapman PeakHeight="422.678" PeakDensity="896402.0" PeakScaleHeight="41.359" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
