Magnetic Field Boundaries in Cassini Plasma Spectrometer Data

(2021) Magnetic Field Boundaries in Cassini Plasma Spectrometer Data. Zenodo doi:10.5281/zenodo.5004160 [Dataset]

Abstract

This dataset consists of: get_files.sh - a bash script to download ELS data (.DAT and .LBL) files. crossing_events_urls.txt - a text file containing URLs for each of the ELS data files. get_files.sh reads this file directly. crossing_events.txt - a text file containing the list of crossing events with associated data, obtained by processing Table S1 in [1]. labels.zip - a zip file containing directory with events for each DAT file, in YAML format. plotter.py - a plotting script in Python. requirements.txt - a file indicating dependencies for the plotting script. Data This dataset spans 1259 observations from CAPS ELS, each with a .LBL file and a .DAT file. Together, these take 128 GB of space. To download these files, do: ./get_files.sh in a Bash shell/terminal. The files are stored in the 'data/' folder (created if not present) in the current directory. ELS data files are obtained from NASA's Planetary Data System at https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/CO-E_J_S_SW-CAPS-3-CALIBRATED-V1.0/DATA/CALIBRATED For help in understanding the ELS data files, see the CAPS User Guide at https://pds-ppi.igpp.ucla.edu/ditdos/download?id=pds://PPI/COCAPS_1SAT/DOCUMENT/CAPS_USER_GUIDE/CAPS_PDS_USER_GUIDE_V1_00.PDF. Labels Unzipping the labels.zip file will create a labels/ folder in the current directory, requiring 28MB of space. Within labels/: bs/ - includes bow shock crossing events. mp/ - includes magnetopause crossing events. dg/ - includes known data-gap events. See [1]. sc/ - includes unreliable data events. See [1]. valid/ - union of all files in bs/ and mp/. all/ - union of all files in bs/, mp/, dg/ and sc/. Within the labels/bs/ and labels/mp/ folders: in/ - crossing events with the transition direction as inward. out/ - crossing events with the transition direction as outward. all/ - union of all files in in/ and out/. Each label file is a YAML file containing a 'change_points' field. The entries under this field each indicate the time of a transition event. The other fields ('bimodality' and 'negative_ions') are not relevant for this dataset. Plotting the Data (and Labels) To help visualize the data and labels, we supply a plotting script plotter.py, in Python (version 2.7). First, install dependencies with: pip install -r requirements.txt and then run: ./plotter.py -h to see the available options. Example usage (after downloading data and unzipping labels): ./plotter.py data/ELS_200418018_V01.DAT -l labels/mp/all/ELS_200418018_V01.yaml --interpolated -f max_filter -fsize 100 --title "An Observation from CAPS ELS" will open up a new window with a plot of the data. To directly save to a file, use the '-o savefilename' option. For example, ./plotter.py data/ELS_200418018_V01.DAT -l labels/mp/all/ELS_200418018_V01.yaml --interpolated -f max_filter -fsize 100 --title "An Observation from CAPS ELS" -o ELS_200418018_V01.png References [1] Jackman, C. M., Thomsen, M. F., & Dougherty, M. K. (2019). Survey of Saturn's magnetopause and bow shock positions over the entire Cassini mission: Boundary statistical properties and exploration of associated upstream conditions. Journal of Geophysical Research: Space Physics, 124, 8865– 8883. https://doi.org/10.1029/2019JA026628 The original table of magnetopause and bow shock crossing events can be found at https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2019JA026628&file=jgra55251-sup-0001-Table_SI-S01.txt Grants NASA Contract through JPL with South West Research Institute. Grant Number: 1243218 Science and Technology Facilities Council. Grant Number: ST/L004399/1 NASA. Grant Number: 1243218 Diamond Jubilee Fellowship STFC. Grant Number: ST/L004399/1

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Contributors

Contributor: Caitriona Jackman

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