Ulysses URAP RAR Average E-Field at 144 Seconds Data Description
Ulysses URAP - Unified Radio and Plasma Wave Experiment Bundle
PDS3 DATA_SET_ID = ULY-J-URAP-4-SUMM-RAR-AVG-E-144S-V1.0
ORIGINAL DATA_SET_NAME = ULY JUP URAP RADIO ASTRONOMY REC AVERAGE
E-FIELD 144 SEC
START_TIME = 1992-01-01T00:00:00.000
STOP_TIME = 1992-04-30T23:57:36.000
PDS3 DATA_SET_RELEASE_DATE = 1998-05-01
PRODUCER_FULL_NAME = ROGER HESS
Collection Overview
===================
C USER'S GUIDE TO RAR 144 SECOND AVERAGED DATA FILES
This document describes the contents and format of the RAR 144
second averaged data files.
The time period of 144 seconds was used for the averaging
period because that is the basic cycling time of the
instrument. The RAR continually cycles through a list of
frequencies. There are 16 lists and the list currently in use
is chosen by telecommand. The time period to complete the list
is 144 seconds for the high band of the receiver (for
telemetry bit rates of 1024 and 512 bps, the cycle time is 64
seconds for bit rates of 256 and 128 bps), after which the
instrument begins with the list again. Therefore this period
was chosen for the averaging period.
The format of the data is indicated by the following Fortran
statement which can be used to read the data:
DIMENSION F(0:75)
READ(A24,5(1X,A1),75(1X,1PE11.4))
+ TIME, LO_POL_MODE, LO_SUM_MODE,
+ HI_POL_MODE, HI_SUM_MODE, IBPS, F
The variables are defined as follows:
The date and time of the beginning of the averaging period is
given in TIME in the format yyyy-mm-ddThh:mm:ss.sssZ.
LO_POL_MODE and HI_POL_MODE are the polarization modes of the
low and high receiver bands. Their values are defined as:
1: Polarization on.
2: Polarization off.
3: Polarization mode switched during the averaging interval.
4: Polarization mode was unknown (usually due to a data gap).
LO_SUM_MODE and HI_SUM_MODE are the polarization modes of the
low and high receiver bands. Their values are defined as:
1: Summation on.
2: Summation off.
3: Summation mode switched during the averaging interval.
4: Summation mode was unknown (usually due to a data gap).
IBPS indicates the telemetry bit rate during the averaging
interval. Its values are defined as:
1: 128 bps.
2: 256 bps.
3: 512 bps.
4: 1024 bps.
5: Bit rate changed during the averaging period.
6: Bit rate unknown - usually due to a data gap.
F is a vector containing the average signal for the 76
frequencies of the low and high bands. Elements 0 through 63
are from the low band receiver and correspond to frequencies
of 1.25+0.75*N KHz where N is the element number (0..63). The
frequency channels from 64 to 75 correspond to the following
frequencies:
F(64): 52 KHz
F(65): 63 KHz
F(66): 71 KHz
F(67): 100 KHz
F(68): 120 KHz
F(69): 148 KHz
F(70): 196 KHz
F(71): 272 KHz
F(72): 387 KHz
F(73): 540 KHz
F(74): 740 KHz
F(75): 940 KHz
The units of the data are microvolt/Hz**.5 measured at the
receiver input terminals. To convert to electric field
strength the given data must be divided by the effective
length of the antenna. This is complicated by the fact that
the effective length depends on the antenna impedance which is
affected by the plasma conditions local to the Ulysses
spacecraft. The impedance will also depend on the frequency.
In general, the RAR frequency channels that are well above the
local electron plasma frequency are not affected by the plasma
conditions and the effective length of 23 meters can be used.
When the RAR is in summed, rather than separate, mode the
determination of field strengths is even more difficult.
References:
===========
Barrow, C.H., and A. Lecacheux, Radio Emission from Jupiter
Observed by Ulysses Before and After Encounter, Astron.
Astrophys, 271, 335-343, 1993.
Canu, P., N. Cornilleau-Werhlin, C. de Villedary, P.J. Kellogg,
C.C. Harvey, and R.J. MacDowall, Observation of Electron Plasma
Waves Upstream of Jupiter's Bow Shock by the URAP Experiment on
board the Ulysses Spacecraft, in Proc. of the 2nd European
Workshop on Collisionless Shocks, Issy-les-Moulineaux, France,
30 Sept-2 Oct 1992.
(https://doi:10.1016/0032-0633(93)90088-J)
Canu, P., N. Cornilleau-Werhlin, C. de Villedary, P.J. Kellogg,
C.C. Harvey, and R.J. MacDowall, Observations of Electron Plasma
Waves Upstream of the Jovian Bow Shock, Plan. Space Sci., 41,
811-822, 1993.
(https://doi:10.1016/0032-0633(93)90088-J)
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20, 2259-2262, 1993.
(https://doi.org/10.1029/93GL01120)
Farrell, W.M., R.J. MacDowall, R.A. Hess, M.L. Kaiser, M.D.
Desch, and R.G. Stone, An Interpretation of the Broadband
VLF Waves near the Io Torus as Observed by Ulysses, J.
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(https://doi.org/10.1029/93JA02591)
Hoang, S., N. Meyer-Vernet, M. Moncuquet, A. Lecacheux, and B.M.
Pedersen, Electron Density and Temperature in the Io Torus from
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41, 1011-1020, 1993.
(https://doi:10.1016/0032-0633(93)90105-B)
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from Ulysses, Proc. of the Third International Workshop, Graz,
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35-43, 1992.
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Stone, A. Lecacheux, B.-M. Pedersen, and P. Zarka, Ulysses
Observations of Escaping VLF Emissions from Jupiter, Geophys.
Res. Let., 19, 649-652, 1992.
(https://doi:10.1029/92GL00387)
Kaiser, M.L., Time-variable Magnetospheric Radio Emissions from
Jupiter, J. Geophys. Res., Vol. 98, pp. 18757-18765, 1993.
(https://doi.org/10.1029/93JE01279)
Kaiser, M.L., M.D. Desch, and W.M. Farrell, Clock-like
Behavior of Jovian Continuum Radiation, Plan. Space Sci.,
41, 1073-1077, 1993.
(https://doi:10.1016/0032-0633(93)90110-N)
Kaiser, M.L., M.D. Desch, W.M. Farrell, R.A. Hess, and R.J.
MacDowall, Ordinary and Z-Mode Emissions from the Jovian
Polar Region, Plan. Space Sci., 41, 977-985, 1993.
(https://doi:10.1016/0032-0633(93)90102-8)
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and R.J. Forsyth, Measurement of Electric Fields and Plasma
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(https://doi.org/10.1029/92JA02982)
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Kaiser, M.D. Desch, W.M. Farrell, R.J. MacDowall, and R.G.
Stone, In Ecliptic Observations of Jovian Radio Emissions
by Ulysses: Comparison with Voyager Results, Geophys. Res.
Let., 19, 1307-1310, 1992.
(https://doi.org/10.1029/92GL01037)
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Wehrlin, P. Canu, C. de Villedary, L. Rezeau, A. Balogh, and
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(https://doi.org/10.1029/93JA02593)
Lin, N., P.J. Kellogg, J.P. Thiessen, D. Lengyel-Frey, B.T.
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1993.
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1994.
(https://doi.org/10.1029/93JA03398)
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Wehrlin, M.D. Desch, C. de Villedary, J. Fainberg, W.M. Farrell,
K. Goetz, R.A. Hess, S. Hoang, M.L. Kaiser, P.J. Kellogg, A.
Lecacheux, N. Lin, R.J. MacDowall, R. Manning, C.A. Meetre, N.
Meyer-Vernet, M. Moncuquet, V. Osherovich, M.J. Reiner, A. Tekle,
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1992.
(https://doi.org/10.1126/science.257.5076.1524)
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Collapse in the Jovian Foreshock, Plan. Space Sci., 41,
823-832, 1993.
(https://doi:10.1016/0032-0633(93)90089-K)
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and P. Canu, Quelques resultats marquants de la rencontre
Ulysses-Jupiter, Bulletin de la S.F.P., 90, 3-9, 1993.
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