[nabobalis]

Summary

Fixes #18.

temperature_response(channel, spectra, obstime=None, *, chiantifix=False)
  R = spectra.temperature_response(channel)            # includes C_EVE when include_eve_correction
  if chiantifix: R += spectra.meta["chiantifix"][channel.name]
  if obstime:    R = degradation(obstime)[:, None] * R  # (n_time, n_T) for an array of times

• get_source_spectra() returns SolarSoft's V9 emissivity (CHIANTI 9.0.1) as a sunkit-instruments SourceSpectra. It downloads a 2.5 MB file once, from Add the AIA V9 summed emissivity for aiapy backup-files#15.
• temperature_response(Channel(94 * u.AA, include_eve_correction=True), get_source_spectra(), t, chiantifix=True) is aia_get_response(/temperature,/dn,/evenorm,/chiantifix,timedepend_date=t).
• chiantifix=True raises without EVE normalization or with other spectra.

Builds on #419. The download needs LM-SAL/backup-files#15.

Evidence

• test_idl.py::test_temperature_response_consistent covers the 7 EUV channels × (plain, /evenorm, /evenorm /chiantifix) × (no time, 2015-01-01). Every temperature is within 1.1e-4 of aia_get_response, and within 3.4e-6 with Fold the temperature response on the spectra wavelengths sunpy/sunkit-instruments#231. The tolerance tightens to 1e-5 once Remove negative intensities before deconvolution - [merged] #231 is released.
• Against sdo.aia 1.3.0 temperature_response (SolarSoft tables) in the same cases: 1.1e-4, or 3.4e-6 with Remove negative intensities before deconvolution - [merged] #231.
• The emissivity is scaled by 12398 eV Å / hc so that the fold with Channel's exact hc reproduces SolarSoft, which converts to DN with hc = 12398 eV Å. Wavelength responses keep the exact hc.

Merge Danger

Door: two-way

Blast Radius: new functions only; the first use downloads 2.5 MB.

Summary by Sourcery

Add SolarSoft-compatible temperature response functions for AIA EUV channels.

New Features:

• Add temperature response calculations for AIA EUV channels using SolarSoft-compatible source spectra, EVE normalization, empirical CHIANTI corrections, and time-dependent degradation.
• Provide cached retrieval of SolarSoft V9 emissivity data and an example demonstrating temperature response workflows.

Enhancements:

• Expose the new temperature response APIs through the response package.

Documentation:

• Document temperature response usage in a new example and changelog entry.

Tests:

• Add unit and SolarSoft consistency tests covering channel corrections, degradation times, array inputs, and validation errors.

[sourcery-ai]

Reviewer's Guide

Introduces cached SolarSoft emissivity loading and temperature-response computation for AIA channels, with optional EVE/CHIANTI corrections and time-dependent degradation, backed by numerical SolarSoft comparisons, focused unit tests, and an example.

File-Level Changes

Change	Details	Files
Add public APIs for loading SolarSoft V9 emissivity data and computing AIA temperature responses.	Download and cache the verified 2.5 MB emissivity FITS file, converting its temperature, wavelength, emissivity, density, metadata, and CHIANTI-fix tables into SourceSpectra. Fold source spectra through a channel response, optionally apply EVE normalization, CHIANTI correction, and time-dependent degradation, including scalar and array observation times. Export the new APIs from the response package.	aiapy/response/temperature.py aiapy/response/__init__.py
Add coverage validating numerical compatibility, input constraints, and time-axis behavior.	Compare all EUV channels and response options against SolarSoft IDL outputs. Test expected response values, CHIANTI-fix validation, and array-obstime shape/equivalence behavior.	aiapy/response/tests/test_temperature.py aiapy/tests/test_idl.py aiapy/tests/data/aia_V10_20201119_190000_response_table.txt
Document and demonstrate temperature-response workflows.	Add a changelog entry and an example covering EVE normalization, CHIANTI correction, degradation, and multiple observation times.	changelog/443.feature.rst examples/temperature_response.py

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