<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-19 -078 11:40:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x 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" >
2026.03.19 (078) 11:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607803191140009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="10.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.820" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.330" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.850" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.910" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" 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="24" Val="109.570" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" 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="10.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="436.364" 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="2.925" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.136" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="320.168" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="238.823" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.163" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.950" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="106.187" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.183" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="59.282" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="143.940" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.140" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="97">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 297.500 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 302.500 305.000 305.000 305.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 318.333 321.667 325.000 325.000 325.000 327.500 330.000 330.000 332.500 335.000 335.000 340.000 340.000 342.500 345.000 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 362.500 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 382.500 385.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 405.000 406.250 407.500 408.750 410.000 410.000 415.000 415.000 417.500 420.000 420.000 425.000 425.000 425.000 430.000 430.000 432.922 436.364 440.478 445.482 451.700 459.634 470.109 484.578 505.864 540.267
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 66 69 69 0 66 54 0 60 60 54 60 0 60 63 0 66 63 0 0 54 57 60 0 60 60 0 57 60 54 54 0 54 48 57 63 57 63 66 60 63 54 66 69 63 69 57 63 63 57 60 48 63 57 63 54 0 45 72 69 69 63 72 66 63 0 72 72 66 0 0 0 63 63 63 60 45 60 60 57 63 57 60 51 45 0 0 0 51 48 0 48 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 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 -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 2.734375 1.953125 -0.390625 -1.171875 0.390625 -0.390625 -1.171875 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
109.570 110.909
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
111.000 112.000 113.000 114.000 115.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 107.500 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 63 69 66 63 63 69 0 63 69 69 60 48 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.561 90.0 95.0 100.0 105.0 110.0 113.555 115.0 117.111 120.0 120.666 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 320.168 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.236 1.956 2.519 2.815 2.91 2.789 2.789 2.789 2.887 2.91 3.097 3.306 3.507 3.702 3.892 4.079 4.262 4.444 4.623 4.802 4.981 5.159 5.337 5.517 5.697 5.878 6.061 6.245 6.432 6.62 6.811 7.005 7.202 7.401 7.604 7.81 8.019 8.231 8.447 8.665 8.886 9.108 9.329 9.547 9.758 9.955 10.13 10.272 10.366 10.4 10.4 10.393 10.373 10.34 10.294 10.238 10.17 10.093 10.007 9.913 9.81 9.701 9.586 9.465 9.339 9.209 9.075 8.937 8.796 8.653 8.508 8.361 8.213 8.065 7.915 7.765 7.616 7.466 7.317 7.169 7.021 6.875 6.73 6.586 6.444 6.303 6.164 6.027 5.892 5.758 5.627 5.498 5.371 5.246 5.123 5.002 4.884 4.768 4.654 4.542 4.432 4.325 4.22 4.117 4.016 3.918 3.821 3.727 3.634 3.544 3.456 3.37 3.285 3.203 3.123 3.044 2.967 2.892 2.819 2.748 2.678 2.61 2.544 2.479 2.416 2.354 2.294 2.236 2.178 2.123 2.068 2.015 1.964 1.913 1.864 1.816 1.769 1.724 1.679 1.636 1.594 1.553 1.513 1.474 1.436 1.399 1.362 1.327 1.293 1.259 1.227 1.195 1.164 1.134 1.105 1.076 1.048 1.021 0.994 0.969 0.944 0.919 0.895 0.872 0.849 0.827 0.806 0.785 0.765 0.745 0.725 0.707 0.688 0.67 0.653 0.636 0.619 0.603 0.588 0.572 0.558 0.543 0.529 0.515 0.502 0.489 0.476

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.91" PeakHeight="110.0" Num="3" Error="0.0">
-30.118 12.59 -2.911
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.91" EndFrequency="10.4" PeakHeight="320.168" Num="5" zHalfNm="238.823" Error="1.331">
-167.097 -48.481 17.299 -0.931 -0.292
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="10.666" Depth="0.121"/>
<TopsideChapman PeakHeight="320.168" PeakDensity="1341935.5" PeakScaleHeight="59.282" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
