Downloading and plotting a HMI lightcurve

This example shows how to download HMI data from JSOC and make a lightcurve plot.

import matplotlib.pyplot as plt

import drms

First we will create a drms.Client, using the JSOC baseurl.

client = drms.Client()

Construct the DRMS query string: “Series[timespan]”

qstr = "hmi.ic_720s[2010.05.01_TAI-2016.04.01_TAI@6h]"

# Send request to the DRMS server
print("Querying keyword data...\n -> {qstr}")
result = client.query(qstr, key=["T_REC", "DATAMEAN", "DATARMS"])
print(f" -> {int(len(result))} lines retrieved.")

Querying keyword data...
 -> {qstr}
 -> 8649 lines retrieved.

Now to plot the image.

# Convert T_REC strings to datetime and use it as index for the series
result.index = drms.to_datetime(result.pop("T_REC"))

# Note: DATARMS contains the standard deviation, not the RMS!
t = result.index
avg = result.DATAMEAN / 1e3
std = result.DATARMS / 1e3

# Create plot
fig, ax = plt.subplots(1, 1, figsize=(15, 7))
ax.set_title(qstr, fontsize="medium")
ax.fill_between(
    t,
    avg + std,
    avg - std,
    edgecolor="none",
    facecolor="b",
    alpha=0.3,
    interpolate=True,
)
ax.plot(t, avg, color="b")
ax.set_xlabel("Time")
ax.set_ylabel("Disk-averaged continuum intensity [kDN/s]")
fig.tight_layout()

plt.show()