Time series plot of magnetic field data

See more:

Python

graph

Jupyter

I have data in excel sheet, having two columns (YEAR, nT), now I want to plot these two but I'm not getting the required graph, the code is

import numpy as np

import pandas as pd

import matplotlib.pyplot as plt

M1 = pd.read_csv('MF.csv', parse_dates=['YEAR'], index_col='YEAR')

M1 = pd.read_csv('MF.csv', parse_dates=['YEAR'], index_col='YEAR')

M1.plot(linewidth=1,color="k",xlabel = 'Time',ylabel = 'Scalar B, nT', title = 'Hourly Magnetic field from 1964 to 2021'). 

from pylab import rcParams
rcParams['figure.figsize'] = 14,10
plt.savefig('Hourly.png', format='png', dpi=1200)
plt.grid(False)
plt.show()

What I have tried:

The resulting graph which I'm getting is Hourly Magnetic field which is not Smooth, my data is from 1964 to 2021.

Is there any other approach for getting smooth and better graph?