G. Michalek

TL;DR: In this article, the authors reported that the abundance of halo coronal mass ejections (CMEs) in cycle 24 is higher than in cycle 23, although the sunspot number has dropped by approx. 40%.

TL;DR: Using magnetic and microwave butterfly diagrams, Wang et al. as mentioned in this paper compare the behavior of solar polar regions to show that the polar magnetic field and the microwave brightness temperature during the solar minimum substantially diminished during the cycle 23/24 minimum compared to the 22/23 minimum.

Abstract: In the present paper we report on the difference in angular sizes between radio-loud and radio-quiet CMEs. For this purpose we compiled these two samples of events using Wind/WAVES and SOHO/LASCO observations obtained during 1996 – 2005. We show that the radio-loud CMEs are almost twice as wide as the radio-quiet CMEs (considering expanding parts of CMEs). Furthermore, we show that the radio-quiet CMEs have a narrow expanding bright part with a large extended diffusive structure. These results were obtained by measuring the CME widths in three different ways.

TL;DR: In this paper, the statistical properties of narrow coronal mass ejections (CMEs, angular width < 20°) with particular emphasis on comparison with normal CMEs were reported.

TL;DR: In this paper, the cross-field diffusion coefficient of charged particles in the presence of pure isotropic Alfven waves and their mixture is considered using Monte Carlo particle simulations, and it is demonstrated that transport perpendicular to the average magnetic field is mostly determined by compound diffusion which combines the effects of scattering off magnetic irregularities with magnetic braiding.