<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 23:50:00.000"
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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% PACIFIC flags: Multiple candidates for F2x cusp, F2 cusps do not match, Unidentified traces above foF2</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" >
2026.04.03 (093) 23:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609304032350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.580" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.284" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="295.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="295.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="400.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="407.711" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="321.331" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.066" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="122.754" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.583" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.115" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="103.130" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.720" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="93">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 300.000 301.429 302.857 304.286 305.714 307.143 308.571 310.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 321.667 323.333 325.000 326.250 327.500 328.750 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 331.364 332.727 334.091 335.455 336.818 338.182 339.545 340.909 342.273 343.636 345.000 355.000 355.000 385.000 380.000 375.000 375.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 385.000 390.000 392.500 395.000 397.500 400.000 405.000 417.500 430.000 442.500 455.000 459.844 464.688 469.531 474.375 479.219 484.063 488.906 493.750 498.594 503.438 508.281 513.125 517.969 522.813 527.656 532.500 537.344 542.188 560.015 580.988 606.023 636.423
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
72 72 0 0 0 0 0 0 60 63 63 69 69 63 0 63 0 0 0 0 0 57 0 0 0 63 63 63 0 60 57 57 75 72 0 0 0 0 0 0 0 0 0 0 75 69 63 57 66 69 69 60 60 60 63 0 60 60 0 63 54 54 0 0 0 51 51 0 0 0 57 60 0 0 0 0 0 0 0 0 0 0 0 0 0 45 54 0 0 51 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 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 0.390625 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 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -1.171875 2.734375 0.390625 0.390625 0.390625 2.734375 2.734375 2.734375 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -0.390625 1.953125 0.390625 -2.734375 -1.171875 -1.171875 1.171875 -1.953125 -1.171875 -2.734375 -1.171875 -1.953125
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.712 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.423 185.0 190.0 195.0 200.0 205.0 210.0 215.0 217.135 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 407.711 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.332 0.314 0.289 0.255 0.208 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.215 0.237 0.259 0.28 0.302 0.323 0.345 0.354 0.41 0.489 0.564 0.643 0.728 0.824 0.933 1.06 1.212 1.397 1.627 1.918 2.283 2.724 3.215 3.715 4.194 4.636 5.042 5.412 5.749 6.057 6.338 6.594 6.828 7.041 7.234 7.408 7.564 7.704 7.826 7.932 8.023 8.098 8.158 8.202 8.233 8.248 8.25 8.249 8.24 8.222 8.196 8.162 8.121 8.073 8.018 7.957 7.891 7.819 7.743 7.662 7.577 7.489 7.398 7.303 7.206 7.107 7.006 6.903 6.799 6.694 6.587 6.48 6.372 6.264 6.156 6.048 5.94 5.832 5.725 5.618 5.512 5.407 5.303 5.199 5.096 4.995 4.895 4.795 4.697 4.601 4.505 4.411 4.319 4.228 4.138 4.049 3.962 3.877 3.793 3.71 3.629 3.549 3.471 3.395 3.319 3.245 3.173 3.102 3.032 2.964 2.897 2.832 2.767 2.704 2.643 2.583 2.524 2.466 2.409 2.354 2.3 2.247 2.195 2.144 2.095 2.046 1.999 1.952 1.907 1.863 1.819 1.777 1.735 1.695 1.655 1.617 1.579 1.542 1.506 1.471 1.436 1.402 1.37 1.337 1.306 1.275 1.245 1.216 1.187 1.159 1.132 1.106 1.079 1.054 1.029 1.005 0.981 0.958 0.935 0.913 0.892 0.871 0.85 0.83 0.811 0.791

</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="8.25" PeakHeight="407.711" Num="5" zHalfNm="321.331" Error="5.898">
-219.729 46.959 -25.704 6.456 1.442
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="107.135" Depth="0.154"/>
<TopsideChapman PeakHeight="407.711" PeakDensity="844447.9" PeakScaleHeight="65.115" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
