# Simulation Grid Choices for OpenGGCM Model

OpenGGCM uses stretch-cartesian grid: an orthogonal grid with variable spacing in each of the coordinate directions. CCMC is currently offering four grids for OpengGGCM runs:

**Grid with 3,150,000 cells:**

- Simulation box size:

-350 R_{E}< x < 24 R_{E}

|z|, |y| < 48

- (NX=315, NY=100, NZ=100)

- You can examine this grid in more detail by viewing the results of request CCMC_CCMC_041008_1 and choosing the "Show simulation grid" option.

- Simulation box size:
**Overview grid, ~ 6,5 mln. cells:**

- Simulation box size:

-350 R_{E}< x < 24 R_{E}

|z|, |y| < 48

- (NX=455, NY=120, NZ=120)

- You can examine this grid in more detail by viewing the results of request CCMC_CCMC_050808_1 and choosing the "Show simulation grid" option.

- Simulation box size:
**Grid with emphasis on dayside magnetopause, ~ 6,5 mln. cells**

- Simulation box size:

-350 R_{E}< x < 24 R_{E}

|z|, |y| < 48

- (NX=455, NY=120, NZ=120)

- You can examine this grid in more detail by viewing the results of request CCMC_CCMC_050808_2 and choosing the "Show simulation grid" option.

- Simulation box size:
**Grid with emphasis on near- and mid-tail, ~ 9 mln. cells:**

- Simulation box size:

-350 R_{E}< x < 24 R_{E}

|z|, |y| < 48

- (NX=426, NY=144, NZ=144)

- You can examine this grid in more detail by viewing the results of request CCMC_CCMC_050808_3 and choosing the "Show simulation grid" option.

- Simulation box size:

Please note that if you require a special grid, please specify so in the "Special Request" box at the end of run submission and/or contact the CCMC staff.

Updated: Feb. 4, 2020 by Lutz Rastätter