# Assessment Instructions: Problem Set 01 — Solar Structure and Scale Heights

## 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 correct scale-height arithmetic and correct ordinal comparison to the lab's two computed values.
- Problem 2: verify the inverse-gravity scaling of scale height is applied correctly (larger radius -> smaller g -> larger H).
- Problem 3: verify both ratios are computed correctly and the physical explanation invokes non-radiative heating, not merely restating the temperature values.
- Problem 4: verify the volume fraction uses the cube of the radius fraction, not the radius fraction itself.

## 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
- Using the radius fraction directly as a volume fraction (forgetting the cube).
- Reversing the direction of the gravity-scale height relationship (claiming larger radius gives smaller scale height).
- Treating the core/surface temperature ratio and the corona/surface temperature ratio as evidence for the same physical mechanism.