Roman Perez-Enriquez

CME associations with quiet and active solar features

Abstract While studying CME phenomenology the existence of different physical conditions were considered. These conditions are roughly described by the CME association to different solar active phenomena. We considered three different typical locations in which CME and associated solar activity may occur; in sunspots, plages and the large scale magnetic field pattern, which has not been included earlier. No matter the large uncertainty of the CME association to solar features, due to the observational method and the CME scale; from data exploration some tendencies were obtained and discussed. No evidence was found that the process that leads to coronal mass ejections starts before their detection at 1.6 solar radii. This indicates that the whole volume moves upward simultaneously, no matter how deep it reaches into the solar atmosphere.

The association of Coronal Mass Ejections during solar maximum times with the heliomagnetic current sheet

Abstract The distance distribution of Coronal Mass Ejections (CMEs) with respect to the Heliomagnetic Current Sheet is studied. The analysis is carried out for all CMEs observed by the Solar Maximum Mission Satellite, years 1980 and 1984–86. We foud that during solar minimum times the CMEs are better associated with the heliomagnetic equator than at solar maximum.

Cme Phenomenology in Different Solar Magnetic Scenarios

The existence of three magnetic scenarios with magnetic field intensities one order apart was considered. CMEs were associated to different solar activity phenomena and solar features showing different characteristics. Those associated to intense magnetic fields were more complex, having either more components or multiple emissions and a greater magnetic energy to particle acceleration conversion rate. On the other hand, simple CMEs were found to associate to weak magnetic fields. No evidence was found that the process that leads to CME starts before their detection at 1.6 solar radii. This indicates that the whole volume moves upward simultaneously, no matter how deep it reaches into the solar atmosphere.

The geomagnetic response to the Earth's crossing of the heliospheric current sheet

Abstract We have performed a superposed epoch analysis of the aa index of geomagnetic activity with respect to the Earths crossing of the heliospheric current sheet during periods when quiet and fluctuating activities are detected from 1976 to 1985. We found a statistically significant increase of the geomagnetic activity during sector boundary crossings and that a pattern of quiet followed by fluctuating activity is associated in about 70% of the cases with sector boundary crossings.