Beschreibung:
<jats:p>We study the local variation of the geomagnetic field measured by the
Huancayo Geomagnetic Observatory, Peru, during 2001-2010. Initially, we
sought to relate the SFI values, stored daily in the NOAA's National
Geophysical Data Center, with the corresponding geomagnetic index; however,
no relation was observed. Nonetheless, subsequently, a comparison between the
monthly geomagnetic-activity index and the monthly SFI average allowed
observing a temporal correlation between these average indices. This
correlation shows that the effect of the solar flares does not simultaneously
appear on the corresponding magnetic indices. To investigate this, we
selected the most intense X-class flares; then, we checked the magnetic field
disturbances observed in the Huancayo Geomagnetic Observatory magnetograms.
We found some disturbances of the local geomagnetic field in the second and
third day after the corresponding solar flare; however, the disturbance
strength of the local geomagnetic field is not correlated with the X-class of
the solar flare. Finally, there are some disturbances of the local
geomagnetic field that are simultaneous with the X-class solar flares and
they show a correlation with the total flux of the solar flare.</jats:p>