astronomy

Description

This little branch adds an interesting "wow" effect by not blanking frames. You can configure a key

Describe the feature

Previously, Heliopy replaced the FILLVAL defined for a variable in a CDF file with np.nan (cf. https://github.com/heliopython/heliopy/blob/0.15.4/heliopy/data/util.py#L825). Is there a reason why this is not done in SunPy's read_cdf()? (Probably @dstansby)

Proposed solution

Adopt old Heliopy code from https://github.com/heliopython/heliopy/blob/0.15.4/heliopy/

The Zip library we are currently using for the unzipFile command does not handle the Zip64 extension that makes it support >4 GiB files.

We could look into using the diskcache package to cache MAST search operations:

https://pypi.org/project/diskcache/

The package is a disk-based key-value store which makes it easy to specify an expiration time for each entry. This would allow us to e.g. cache search queries for 24 hours, which would significantly speed up searches across different Python processes, whilst largely avoiding