Solar flares and variation of local geomagnetic field: Measurements by the Huancayo Observatory over 2001-2010

Solar flares and variation of local geomagnetic field: Measurements by the Huancayo Observatory over 2001-2010

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 relat...

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Bibliographic Details
Published in:Serbian astronomical journal. Vol. 2017; no. 194; pp. 87 - 99
Main Authors: Carlos, Reyes, Gárate, Ayesta, Reyes, Navarro
Format: Journal Article
Language:English
Published: Astronomical Observatory of Belgrade 2017
Astronomical Observatory, Department of Astronomy, Belgrade
Subjects:
Earth
Forecasts and trends
gamma rays
Geomagnetic fields
magnetic fields
Natural history
Solar flares
Sun: coronal mass ejections (CMEs)
Sun: flares
Sun: X-rays
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Summary: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. nema
ISSN:1450-698X
1820-9289
DOI:10.2298/SAJ160424002C