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https://github.com/beforerr/dmsp_elfin

https://github.com/beforerr/dmsp_elfin

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  • Host: GitHub
  • Owner: Beforerr
  • License: mit
  • Language: Julia
  • Default Branch: main
  • Size: 132 KB
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Created about 1 year ago · Last pushed 11 months ago
Metadata Files
Readme License

README.md

DMSP-ELFIN Conjunction Finder [WIP]

This tool identifies conjunction events between DMSP and ELFIN satellites based on their MLT (Magnetic Local Time) and MLAT (Magnetic Latitude) values.

What is a Conjunction Event?

A conjunction event is defined when: - The absolute difference in MLT between DMSP and ELFIN is less than a threshold d₁ - The absolute difference in MLAT between DMSP and ELFIN is less than a threshold d₂ - This condition persists for at least Tₘᵢₙ seconds

Usage

Basic Usage

bash julia conjunction_finder.jl --dmsp path/to/dmsp_data.gz --elfin path/to/elfin_data.csv

Generate Sample Data

If you don't have real ELFIN data available, you can generate sample data based on DMSP data:

bash julia conjunction_finder.jl --generate-sample

Full Options

bash julia conjunction_finder.jl --dmsp path/to/dmsp_data.gz \ --elfin path/to/elfin_data.csv \ --mlt-threshold 0.5 \ --mlat-threshold 2.0 \ --min-duration 60 \ --output conjunction_events.csv

Input Data Format

DMSP Data

See DMSP notebook

ELFIN Data

See ELFIN notebook

Output

The script produces: 1. A CSV file with conjunction events (start time, end time, duration) 2. A JSON file with summary statistics 3. Plot images for each conjunction event showing MLT and MLAT values

Example

```bash

Download DMSP data and find conjunctions with generated ELFIN data

julia conjunction_finder.jl --dmsp https://www.ncei.noaa.gov/data/dmsp-space-weather-sensors/access/f17/ssj/2022/10/j5f1722288.gz --generate-sample --mlt-threshold 0.3 --mlat-threshold 1.5 --min-duration 120 ```

This will: 1. Download DMSP data from the specified URL 2. Generate sample ELFIN data based on the DMSP data 3. Find conjunction events where MLT difference < 0.3 hours and MLAT difference < 1.5 degrees 4. Only include events lasting at least 120 seconds 5. Save results to conjunctionevents.csv and conjunctionstats.json 6. Create plots for each conjunction event in the plots/ directory

Project Structure

  • conjunction_finder.jl: Main script for finding conjunctions
  • run.sh: Convenience script to run the conjunction finder

Archive files:

  • DMSPReader.jl: Module for reading DMSP SSJ data files

Owner

  • Name: Beforerr
  • Login: Beforerr
  • Kind: user

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