Switching from HelioviewerClient to hvpy#

In older versions of sunpy it was possible to query Helioviewer using the HelioviewerClient. The Helioviewer Project now maintains a Python wrapper around their API that supersedes this. It is called hvpy and their documentation has several examples of how to use it. This page explains how to migrate from HelioviewerClient to hvpy.

HelioviewerClient().data_sources is replaced by hvpy.DataSource, an Enum that lists every known data source for Helioviewer.org.

>>> import hvpy

>>> print(hvpy.DataSource.AIA_131)

It also supports tab-complete, to find the data source you want.

HelioviewerClient().get_data_sources is replaced by hvpy.getDataSources().

>>> hvpy.getDataSources()  
{...'SDO': {...'HMI': {'continuum': {'sourceId': 18,

HelioviewerClient().get_closest_image is replaced by hvpy.getClosestImage().

>>> from datetime import datetime

>>> hvpy.getClosestImage(date=datetime(2022, 1, 1), sourceId=hvpy.DataSource.AIA_171)  
 {'id': '79024526', 'date': '2022-01-01 00:04:57', 'name': 'AIA 171', 'scale': 0.5899466652089547, 'scaleCorrection': 1.0170411248743723, 'width': 4096, 'height': 4096, 'refPixelX': 2048.5, 'refPixelY': 2048.5, 'rotation': 0, 'rsun': 1626.6638, 'dsun': 147091270000, 'sunCenterOffsetParams': [], 'layeringOrder': 1}

HelioviewerClient().download_jp2 is replaced by hvpy.getJP2Image(), but you will have to wrap the call using hvpy.save_file() to save the data to disk.

>>> filepath = hvpy.save_file(hvpy.getJP2Image(date=datetime.today(), sourceId=hvpy.DataSource.AIA_171), filename="~/example.jpeg")  
>>> filepath.unlink()  

HelioviewerClient().get_jp2_header is replaced by hvpy.getJP2Header(). However you will need to make a call to hvpy.getClosestImage() to get the ID required. Furthermore, the header is returned as a XML string, which you will need to parse.

>>> metadata = hvpy.getClosestImage(date=datetime.today(), sourceId=hvpy.DataSource.AIA_171)  
>>> hvpy.getJP2Header(metadata['id'])  
'<?xml version="1.0" encoding="utf-8"?>...

HelioviewerClient().download_png is replaced by hvpy.createScreenshot, it takes the same arguments as the old method expect for progress and directory which do not exist and adds filename so one is able to save the file, otherwise it will save it in the current working directory.

>>> screenshot_location = hvpy.createScreenshot(
...     date=datetime.today(),
...     layers=hvpy.create_layers([(hvpy.DataSource.AIA_171, 100)]),
...     events=hvpy.create_events([hvpy.EventType.ACTIVE_REGION]),
...     eventLabels=True,
...     imageScale=1,
...     x0=0,
...     y0=0,
...     width=100,
...     height=100,
...     filename="my_screenshot",
... )  
>>> screenshot_location.unlink()  

The documentation for hvpy has more examples of how to use it and examples for each function.

If you encounter a problem with the new API, please open an issue on the hvpy issue tracker.