Source code for

#  Author: Rishabh Sharma <>
#  This Module was developed under funding provided by
#  Google Summer of Code 2014

import astropy.units as u
from astropy.time import TimeDelta

from import GenericClient
from sunpy.time import TimeRange
from sunpy.util.scraper import Scraper

__all__ = ['NoRHClient']

BASEURL = '{freq}%y%m%d'

[docs]class NoRHClient(GenericClient): """ Provides access to the Nobeyama RadioHeliograph (NoRH) averaged correlation time series data. Uses this `ftp archive <>`__ hosted by the `NoRH Science Center <>`__. Queries to NoRH should specify either 17GHz or 34GHz as a Wavelength. Examples -------- >>> import astropy.units as u >>> from import Fido, attrs as a >>> results ="2016/1/1", "2016/1/2"), ... a.Instrument.norh, a.Wavelength(17*u.GHz)) #doctest: +REMOTE_DATA >>> results #doctest: +REMOTE_DATA < object at ...> Results from 1 Provider: <BLANKLINE> 2 Results from the NoRHClient: Start Time End Time Source Instrument Wavelength ------------------- ------------------- ------ ---------- -------------- 2016-01-01 00:00:00 2016-01-02 00:00:00 NAOJ NORH 17000000.0 kHz 2016-01-02 00:00:00 2016-01-03 00:00:00 NAOJ NORH 17000000.0 kHz <BLANKLINE> <BLANKLINE> """ def _get_url_for_timerange(self, timerange, **kwargs): """ Returns list of URLS corresponding to value of input timerange. Parameters ---------- timerange: `sunpy.time.TimeRange` time range for which data is to be downloaded. Returns ------- urls : list list of URLs corresponding to the requested time range """ # We allow queries with no Wavelength but error here so that the query # does not get passed to VSO and spit out garbage. if 'wavelength' not in kwargs.keys() or not kwargs['wavelength']: raise ValueError("Queries to NORH should specify either 17GHz or 34GHz as a Wavelength." "see") else: wavelength = kwargs['wavelength'] # If wavelength is a single value GenericClient will have made it a # Quantity in the kwargs. if not isinstance(wavelength, u.Quantity): raise ValueError(f"Wavelength to NORH must be one value not {wavelength}.") wavelength =, equivalencies=u.spectral()) if wavelength == 34 * u.GHz: freq = 'tcz' elif wavelength == 17 * u.GHz: freq = 'tca' else: raise ValueError("NORH Data can be downloaded for 17GHz or 34GHz," " see") # If start of time range is before 00:00, converted to such, so # files of the requested time ranger are included. # This is done because the archive contains daily files. if timerange.start.strftime('%M-%S') != '00-00': timerange = TimeRange(timerange.start.strftime('%Y-%m-%d'), timerange.end) norh = Scraper(BASEURL, freq=freq) # TODO: warn user that some files may have not been listed, like for example: # tca160504_224657 on # as it doesn't follow pattern. return norh.filelist(timerange) def _get_time_for_url(self, urls): freq = urls[0].split('/')[-1][0:3] # extract the frequency label crawler = Scraper(BASEURL, freq=freq) times = list() for url in urls: t0 = crawler._extractDateURL(url) # hard coded full day as that's the normal. times.append(TimeRange(t0, t0 + TimeDelta(1* return times def _makeimap(self): """ Helper Function used to hold information about source. """ self.map_['source'] = 'NAOJ' self.map_['provider'] = 'NRO' self.map_['instrument'] = 'NORH' self.map_['physobs'] = '' @classmethod def _can_handle_query(cls, *query): """ Answers whether client can service the query. Parameters ---------- query : list of query objects Returns ------- boolean answer as to whether client can service the query """ # Import here to prevent circular imports from import attrs as a required = {a.Time, a.Instrument} optional = {a.Wavelength} if not cls.check_attr_types_in_query(query, required, optional): return False # if we get this far we have either Instrument and Time # or Instrument, Time and Wavelength for x in query: if isinstance(x, a.Instrument) and x.value.lower() == 'norh': return True return False
[docs] @classmethod def register_values(cls): from import attrs adict = {attrs.Instrument: [('NORH', ('Nobeyama Radio Heliograph is an imaging radio telescope at 17 ' 'or 34GHz located at the Nobeyama Solar Radio Observatory.'))]} return adict