The relationships between disappearing solar filaments, coronal mass ejections, and geomagnetic activity

Details The relationships between disappearing solar filaments, coronal mass ejections, and geomagnetic activity The relationships between disappearing solar filaments, coronal mass ejections, and geomagnetic activity

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87..401w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Sept. 1983, p. 401-417.

Physics

30

Coronal Loops, Geomagnetism, Magnetic Disturbances, Solar Corona, Solar Terrestrial Interactions, Stellar Mass Ejection, Data Correlation, Filaments, Solar Activity Effects, Solar Cycles, Solar Wind

Scientific paper

The relationships between disappearing solar filaments and geomagnetic activity are examined using data obtained between 1974 and 1980. The average level of geomagnetic activity is found to increase after the disappearance of large filaments. The magnitudes of the geomagnetic disturbances depend upon the sizes and, to a lesser extent, upon the darkness of the filaments. The delays between filament disappearances and resulting geomagnetic disturbances are typically 3-6 days, corresponding to sun-earth velocities 580-290 km/sec. These are consistent with the observed velocities of those coronal mass ejections that are associated with disappearing filaments. The average delay is: (1) shorter for large and dark filaments than for small and faint filaments respectively; (2) shorter during solar maximum than during solar minimum; and (3) dependent in a complex way upon the longitudes of the filaments. Disturbances associated with filaments with longitudes greater than about 50 deg have delays of about 10 days. Quieter than average geomagnetic conditions sometimes occur for several days prior to the geomagnetic disturbances that follows disappearing filaments.

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