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# Copyright (c) 2020 Stefan Bender |
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# |
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# This module is part of pyspaceweather. |
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# pyspaceweather is free software: you can redistribute it or modify |
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# it under the terms of the GNU General Public License as published |
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# by the Free Software Foundation, version 2. |
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# See accompanying COPYING.GPLv2 file or http://www.gnu.org/licenses/gpl-2.0.html. |
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"""Python interface for space weather indices |
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""" |
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import os |
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from pkg_resources import resource_filename |
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import requests |
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import numpy as np |
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import pandas as pd |
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__all__ = ["sw_daily", "ap_kp_3h"] |
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DL_URL = "https://celestrak.com/SpaceData/SW-All.txt" |
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SW_FILE = "SW-All.txt" |
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def _dl_file(swfile): |
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with requests.get(DL_URL, stream=True) as r: |
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with open(swfile, 'wb') as fd: |
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for chunk in r.iter_content(chunk_size=1024): |
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fd.write(chunk) |
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def _get_last_update(swpath): |
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for line in open(swpath): |
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if line.startswith("UPDATED"): |
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# closes the file automatically |
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break |
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return pd.to_datetime(line.lstrip("UPDATED"), utc=True) |
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def check_for_update(swpath, max_age="30days"): |
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last_update = _get_last_update(swpath) |
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file_age = pd.Timestamp.utcnow() - last_update |
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return file_age > pd.Timedelta(max_age) |
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def _read_sw(swpath): |
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kpns = ["Kp{0}".format(i) for i in range(0, 23, 3)] + ["Kpsum"] |
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sw = np.genfromtxt( |
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swpath, |
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skip_header=3, |
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# yy mm dd br rd kp kp kp kp kp kp kp kp Kp ap ap ap ap ap ap ap ap Ap cp c9 is f1 q f2 f3 f4 f5 f6 |
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delimiter=[4, 3, 3, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 2, 4, 6, 2, 6, 6, 6, 6, 6], |
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dtype= "i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,i4,f8,i4,i4,f8,i4,f8,f8,f8,f8,f8", |
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names=[ |
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"year", "month", "day", "bsrn", "rotd", |
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"Kp0", "Kp3", "Kp6", "Kp9", "Kp12", "Kp15", "Kp18", "Kp21", "Kpsum", |
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"Ap0", "Ap3", "Ap6", "Ap9", "Ap12", "Ap15", "Ap18", "Ap21", "Apavg", |
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"Cp", "C9", "isn", "f107_adj", "Q", "f107_81ctr_adj", "f107_81lst_adj", |
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"f107_obs", "f107_81ctr_obs", "f107_81lst_obs" |
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] |
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)[2:-1] |
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sw = sw[sw["year"] != -1] |
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ts = pd.to_datetime([ |
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"{0:04d}-{1:02d}-{2:02d}".format(yy, mm, dd) |
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for yy, mm, dd in sw[["year", "month", "day"]] |
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]) |
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sw_df = pd.DataFrame(sw, index=ts) |
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sw_df[kpns] = 0.1 * sw_df[kpns] |
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return sw_df |
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def sw_daily(swfile=SW_FILE, update_interval="30days"): |
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"""Daily Ap, Kp, and f10.7 index values |
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""" |
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swpath = resource_filename(__name__, os.path.join("data", swfile)) |
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# ensure that the file exists and is up to date |
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if ( |
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not os.path.exists(swpath) |
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or check_for_update(swpath, max_age=update_interval) |
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): |
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_dl_file(swpath) |
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return _read_sw(swpath) |
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def ap_kp_3h(swfile=SW_FILE): |
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"""3h Ap and Kp index values |
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""" |
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daily_df = sw_daily(swfile) |
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ret = daily_df.copy() |
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apns = ["Ap{0}".format(i) for i in range(0, 23, 3)] |
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kpns = ["Kp{0}".format(i) for i in range(0, 23, 3)] |
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for i, (ap, kp) in enumerate(zip(apns, kpns)): |
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ret[ap].index = daily_df[ap].index + pd.Timedelta((i * 3 + 1.5), unit="h") |
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ret[kp].index = daily_df[kp].index + pd.Timedelta((i * 3 + 1.5), unit="h") |
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sw_ap = pd.concat([ret[ap] for ap in apns]) |
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sw_kp = pd.concat([ret[kp] for kp in kpns]) |
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return pd.DataFrame({"Ap": sw_ap, "Kp": sw_kp}) |
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st-bender /
pyspaceweather
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