From ad7a238ed66bacf987214308c9abfff2b4262d17 Mon Sep 17 00:00:00 2001
From: Elena.Budnik <ebudnik@irap.omp.eu>
Date: Mon, 2 Sep 2019 11:24:44 +0200
Subject: [PATCH] small cor in LAP EFL
---
NumericalData/AMDA/Rosetta/LAP/ros-lap-efl.xml | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/NumericalData/AMDA/Rosetta/LAP/ros-lap-efl.xml b/NumericalData/AMDA/Rosetta/LAP/ros-lap-efl.xml
index 5e63633..1bcb5aa 100644
--- a/NumericalData/AMDA/Rosetta/LAP/ros-lap-efl.xml
+++ b/NumericalData/AMDA/Rosetta/LAP/ros-lap-efl.xml
@@ -7,25 +7,26 @@
<ResourceName>e-field component (EFL)</ResourceName>
<AlternateName>Electric field component, calculated on ground by
taking the difference between floating probe measurements on both probes and
-dividing by distance, (V_P2-V_P1)/L. Positive value refers to electric field
-pointing in the direction from probe 1 to probe 2.</AlternateName>
+dividing by distance</AlternateName>
<ReleaseDate>2016-10-15T14:08:29Z</ReleaseDate>
<Description>
The two LAP probes could be used to measure the component of the electric field along their
separation vector, by measuring the voltage of them, taking the difference and dividing by the
separation distance (5.0 m). Each probe could be fed by a bias current as is typically done on
electric field instruments in tenuous plasmas, or be disconnected from the bias circuitry to
-ensure a good zero bias current (floating probes) as is typically done on sounding rockets.
+ensure a good zero bias current (floating probes) as is typically done on sounding rockets.
Bias currents were used in the early part of the mission, but when the comet ionosphere
-developed, the floating mode was found to give much more consistent data. Only data from
+developed, the floating mode was found to give much more consistent data. Only data from
the floating mode have been used for providing E-field data, and only when both probes are
sunlit.
+Positive value refers to electric field pointing in the direction from probe 1 to probe 2.
+
The booms are not equal in length (2.24 and 1.62 m) and mounted on a big spacecraft (solar
panel wingspan 32 m), so one cannot expect LAP to provide a useful DC electric field estimate.
A moving average of the E-field over 32 s is therefore subtracted from the data in the EFL files.
-The effective bandwidth of the data therefore is about 0.03 Hz to 20 Hz, the upper
-limit set by the analog anti-aliasing filters. Note that the filtering may distort the lowest
+The effective bandwidth of the data therefore is about 0.03 Hz to 20 Hz, the upper
+limit set by the analog anti-aliasing filters. Note that the filtering may distort the lowest
frequencies.
There are no external comparison data for assessing the absolute accuracy of the LAP E-field
--
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