Flare and CME Properties and Rates at Sunspot Minimum
نویسندگان
چکیده
The corona at solar minimum generally differs greatly from that during active times. We discuss the current Cycle 23/24 minimum from the point of view of the occurrence of flares and CMEs (Coronal Mass Ejections). By comparison with the previous minimum, the flare/CME ratio diminished by almost an order of magnitude. This suggests that the environmental effect in flare/CME association differed in the sense that the Cycle 23/24 minimum corona was relatively easy to disrupt.
منابع مشابه
Coronal Mass Ejections from Sunspot and non-Sunspot Regions
Coronal mass ejections (CMEs) originate from closed magnetic field regions on the Sun, which are active regions and quiescent filament regions. The energetic populations such as halo CMEs, CMEs associated with magnetic clouds, geoeffective CMEs, CMEs associated with solar energetic particles and interplanetary type II radio bursts, and shock-driving CMEs have been found to originate from sunspo...
متن کاملAn Analysis of the Sunspot Groups and Flares of Solar Cycle 23 (postprint)
Designing a statistical solar flare forecasting technique can benefit greatly from knowledge of the flare frequency of occurrence with respect to sunspot groups. This study analyzed sunspot groups and Hα and X-ray flares reported for the period 1997 – 2007. Annual catalogs were constructed, listing the days that numbered sunspot groups were observed (designated sunspot group-days, SSG-Ds) and f...
متن کاملAre Homologous Flare–coronal Mass Ejection Events Triggered by Moving Magnetic Features?
Coronal mass ejections (CMEs) often present destabilization and eruption of a global (or large-scale) magnetic structure in the solar atmosphere. Furthermore, the Earth-directed CMEs are the primary driver of the disastrous space weather. Here we report on five homologous CMEs. They initiated in the early phase of five homologous X-class flares seen in NOAA Active Region 9236 on 2000 November 2...
متن کاملWas the flare on 5 July 1989 a white light flare ?
The continuous emission spectra of Hα, Hβ, and Hγ wave bands of the solar flare of 5 July 1989 have been analysed. We demonstrate that the flare not only emits at the line centres and wings of Hα, Hβ, and Hγ, but also in the continuum near these lines. The positions, durations, and configurations of the four flare kernels are respectively similar to those of a white light flare (WLF). Therefore...
متن کاملPeriodicities in the occurrence of solar coronal mass ejections
Recent overwhelming evidences (Hiremath 2009a and references there in) show that sun indeed strongly influences the earth’s climate and environment. In addition to well known sunspot activity, right from the era of discovery by Galileo, other activity phenomena such as flares and coronal mass ejections are also the main drivers that input vast amount of energy, mass and momentum into the earth’...
متن کامل