<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 23:10:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.02.26 (057) 23:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605702262310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.522" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.696" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="385.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="385.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="447.676" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="395.148" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.354" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="79.922" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="17.525" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="39.175" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="91.750" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.240" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="123">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
390.000 385.000 390.000 390.000 390.000 390.000 390.000 391.000 392.000 393.000 394.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 401.250 402.500 403.750 405.000 406.250 407.500 408.750 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 435.000 436.667 438.333 440.000 443.750 447.500 451.250 455.000 457.500 460.000 460.000 460.000 460.000 465.000 465.000 465.000 465.000 465.000 465.000 465.000 470.000 470.000 470.000 470.000 475.000 480.000 480.000 480.000 480.000 482.500 485.000 487.500 490.000 490.000 490.000 495.000 495.000 495.000 495.000 498.333 501.667 505.000 505.000 505.000 505.000 507.500 510.000 515.000 520.000 520.000 520.000 522.500 525.000 530.000 530.000 535.000 540.000 540.000 540.000 540.649 541.546 542.866 545.000 549.040 559.593
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 54 0 60 60 57 0 0 0 0 66 66 0 0 63 0 66 69 66 0 0 0 0 0 0 0 69 72 75 72 57 63 57 69 72 69 72 54 57 48 0 0 60 48 66 69 69 69 63 63 54 66 69 69 69 78 66 75 0 63 69 57 63 0 66 0 48 48 54 63 51 63 60 57 60 60 69 60 57 60 66 66 63 66 57 66 0 0 0 57 0 60 66 54 63 69 66 66 60 60 63 69 0 60 0 60 66 69 66 69 69 66 69 54 63 66 69 63 60 63 60 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 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 -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 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 -2.734375 -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 1.953125 -1.953125 2.734375 -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 1.953125 -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
</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" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.057 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.114 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.171 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 447.676 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.33 0.31 0.282 0.243 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.209 0.231 0.254 0.276 0.299 0.322 0.344 0.354 0.4 0.479 0.559 0.642 0.728 0.819 0.914 1.014 1.119 1.228 1.343 1.462 1.587 1.717 1.852 1.992 2.137 2.288 2.444 2.605 2.773 2.946 3.125 3.31 3.501 3.699 3.903 4.115 4.333 4.558 4.791 5.032 5.28 5.536 5.801 6.074 6.356 6.645 6.941 7.244 7.55 7.856 8.155 8.437 8.685 8.877 8.984 9.0 8.997 8.97 8.919 8.844 8.749 8.636 8.507 8.363 8.208 8.042 7.868 7.688 7.501 7.311 7.118 6.923 6.727 6.531 6.335 6.141 5.949 5.76 5.573 5.389 5.209 5.033 4.86 4.692 4.528 4.368 4.213 4.062 3.915 3.773 3.635 3.501 3.372 3.247 3.126 3.009 2.896 2.787 2.682 2.581 2.483 2.388 2.297 2.209 2.125 2.043 1.965 1.889 1.817 1.747 1.679 1.614 1.552 1.492 1.434 1.379 1.325 1.274 1.224 1.177 1.131 1.087 1.045 1.004 0.965 0.927 0.891 0.857 0.823 0.791 0.76 0.731 0.702 0.675 0.648 0.623 0.599 0.575 0.553 0.531 0.511 0.491 0.471 0.453 0.435 0.418 0.402 0.386 0.371 0.357 0.343 0.329 0.316 0.304 0.292 0.281 0.27 0.259 0.249 0.239 0.23 0.221 0.212 0.204

</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="9.0" PeakHeight="447.676" Num="5" zHalfNm="395.148" Error="3.227">
-205.735 -53.628 28.989 -6.339 1.208
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.171" Depth="0.154"/>
<TopsideChapman PeakHeight="447.676" PeakDensity="1004962.75" PeakScaleHeight="39.175" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
