<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-28 -087 20:50:00.000"
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: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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) 20:50:00</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">
FF202608703282050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.460" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.679" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.550" 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="34" Val="110.000" 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="0.550" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="525.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.403" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="398.324" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="309.736" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.526" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="126.394" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.734" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.717" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="140.240" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.480" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.150" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="143">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 301.667 303.333 305.000 306.667 308.333 310.000 311.667 313.333 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 330.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 337.500 340.000 340.000 340.000 342.500 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 367.000 369.000 371.000 373.000 375.000 375.000 375.000 377.500 380.000 382.500 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 420.000 420.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 450.000 450.000 452.500 455.000 455.000 460.000 460.000 465.000 465.000 467.500 470.000 475.000 476.250 477.500 478.750 480.000 485.000 488.333 491.667 495.000 495.000 495.000 505.000 505.000 505.000 510.000 512.500 515.000 520.000 520.000 520.000 522.500 525.000 530.000 535.000 540.000 545.000 550.000 555.000 555.000 560.621 567.010 574.335 582.818 592.757 604.562
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 66 66 60 60 60 60 69 69 63 0 0 0 0 0 0 0 0 57 57 66 69 66 63 0 57 63 0 51 0 66 60 60 0 0 69 60 66 0 63 69 66 0 51 0 66 69 69 66 66 72 63 66 69 63 69 0 0 0 0 63 66 69 0 0 0 66 69 63 69 63 69 69 60 63 63 63 69 60 51 60 0 0 0 63 57 66 66 66 69 69 69 69 66 57 66 54 63 66 54 63 66 66 69 60 66 0 63 57 0 0 0 66 63 0 0 54 60 60 48 57 57 54 51 57 54 51 0 51 48 48 48 48 0 48 51 42 0 48 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -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 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -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 -0.390625 -1.171875 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 -1.171875 -1.171875 1.953125 -1.171875 -1.171875 1.171875 -2.734375 -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 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="68">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 114.167 113.333 112.500 111.667 110.833 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 110.000 110.833 111.667 112.500 113.333 114.167 115.000 115.000 115.000 115.000 114.167 113.333 112.500 111.667 110.833 110.000 110.000 110.000 110.000 110.000 120.000 110.000 110.000 110.000 115.000 115.000 115.000 115.000 115.000 115.000 110.000 111.667 113.333 115.000 116.667 118.333 120.000 122.500 125.000 127.500 130.000 130.833 131.667 132.500 133.333 134.167 135.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 69 72 78 0 0 0 78 0 0 78 81 0 75 69 66 0 0 0 0 57 72 0 0 69 0 0 0 0 0 75 72 72 69 0 63 72 0 0 0 0 0 0 0 63 48 0 0 0 0 0 48 0 0 0 0 0 0 0 0 0 54 54
</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 -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 -1.171875 1.171875 1.171875 1.953125 1.171875 1.171875 1.171875 1.953125 2.734375 1.171875 1.171875
</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" >
89.981 90.0 95.0 100.0 105.0 110.0 115.0 120.0 122.005 125.0 130.0 134.009 135.0 140.0 145.0 146.014 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 398.324 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.202 0.937 1.215 1.358 1.403 1.378 1.3 1.252 1.252 1.252 1.252 1.264 1.327 1.39 1.403 1.538 1.679 1.812 1.944 2.079 2.218 2.364 2.518 2.682 2.855 3.038 3.23 3.433 3.644 3.862 4.086 4.314 4.546 4.779 5.012 5.246 5.479 5.711 5.942 6.171 6.4 6.626 6.852 7.077 7.3 7.523 7.745 7.967 8.188 8.408 8.629 8.849 9.069 9.288 9.506 9.724 9.939 10.151 10.359 10.559 10.747 10.918 11.064 11.174 11.238 11.25 11.249 11.238 11.215 11.179 11.132 11.075 11.007 10.931 10.845 10.752 10.652 10.545 10.432 10.313 10.189 10.061 9.928 9.792 9.653 9.512 9.368 9.222 9.074 8.926 8.776 8.626 8.475 8.325 8.174 8.024 7.874 7.725 7.576 7.429 7.283 7.138 6.995 6.853 6.713 6.574 6.437 6.302 6.169 6.037 5.908 5.781 5.655 5.532 5.411 5.291 5.174 5.059 4.946 4.835 4.726 4.619 4.515 4.412 4.311 4.213 4.116 4.021 3.928 3.838 3.749 3.662 3.576 3.493 3.411 3.331 3.253 3.177 3.102 3.029 2.958 2.888 2.82 2.753 2.688 2.624 2.562 2.501 2.441 2.383 2.326 2.271 2.217 2.164 2.112 2.061 2.012 1.964 1.917 1.871 1.826 1.782 1.739 1.698 1.657 1.617 1.578 1.54 1.503 1.467 1.432 1.397 1.363 1.331 1.299 1.267 1.237 1.207 1.178 1.149 1.122 1.095 1.068 1.042 1.017 0.993 0.969

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.403" PeakHeight="110.0" Num="3" Error="0.0">
-27.884 9.588 -1.723
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.403" EndFrequency="11.25" PeakHeight="398.324" Num="5" zHalfNm="309.736" Error="4.719">
-228.082 -42.285 25.346 -12.047 4.758
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="36.014" Depth="0.151"/>
<TopsideChapman PeakHeight="398.324" PeakDensity="1570254.4" PeakScaleHeight="63.717" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
