# Assessment Instructions: Problem Set 06 — Magnetopause and Ring-Current Extensions

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the referenced dataset(s) under `materials/ASTR370/data/`.

## Grading Standard
Award credit for correct method and units first, then for the specific numeric result. A student who shows correct reasoning with a small arithmetic slip should receive most of the available credit; a student with a correct-looking number but no visible derivation steps should not. Because this is a 300-level quantitative solar physics and space weather course, full marks require a genuine derivation wherever the problem set asks for one, and a genuinely reasoned (not merely asserted) interpretation wherever the problem asks for scientific judgment (e.g., honestly characterizing an order-of-magnitude estimate's uncertainty, or a historical reconstruction's disclosed range).

## Problem-Level Criteria
- Problem 1: verify the comparative placement (closer to quiet or storm) is justified by the density/speed tradeoff, not merely stated.
- Problem 2: verify the exact doubling is confirmed numerically, not just asserted from the word "linear."
- Problem 3: verify the percent-change arithmetic uses the square of the B0 ratio (since E0 depends on B0^2).
- Problem 4: verify the solved speed follows correctly from the pressure-factor and fixed-density assumption.

## Resubmission Policy
Students may resubmit within one week of receiving feedback. A resubmission must show a corrected derivation, not only a corrected final number, and should reference the specific feedback comment it addresses. Regrade to a maximum of 90% of the original point value unless the error was a grading mistake.

## Common Errors to Flag
- Forgetting that E0 depends on B0 squared, not linearly, when computing the percent-change sensitivity.
- Sign or direction errors in the fast-wind standoff-distance comparison.
- Arithmetic errors in extracting v from P_dyn=n m_p v^2 (forgetting the square root).