On July 14, 2000 the active region NOAA 9077 produced one of the largest solar flares
(3B/X5. 7) seen in recent years associated with a violent halo coronal mass ejection (CME) …

In this paper, we examine the observational soft X-ray flares and the relationship with
photospheric vector magnetograms in the active region (NOAA 7070). We analyze the soft X …

Submergence of magnetic flux is demonstrated in the process of evolution of sunspot groups
NOAA 6850 (26 Sep.-07 Oct. 1991) and 7220/22 (06-17 July 1992). In both cases new …

We study photospheric plasma flows in an active region NOAA 8375, by using uninterrupted
high-resolution SOHO/MDI observations (137 intensity images, 44 hours of observations) …

Abstract Comparison of photographic observations and vector-magnetograph
measurements demonstrate that the outer boundary of the sunspot penumbra–even in …

There are compared two methods for finding new magnetic flux (NMF) emerging in active
regions before powerful flares accompanied by halo-type coronal mass ejections at more …

Os fenômenos solares são os principais agentes perturbadores da magnetosfera terrestre e
podem produzir tempestades geomagnéticas. Durante as tempestades geomagnéticas os …

A „Napon látható jelek”-et először egy 3200 éves kínai jós-csont említi. Az első európai adat
szerzője a Napon látható foltokról Theofrasztosz, Arisztotelész tanítványa az Kr. e. 4 …

Events in flare productive active regions (ARs) accompanied by proton flares are considered
on the basis of the observations from the ground and spacecrafts during the recent decades …

Debreceni fotohéliogramok, TRACE fotoszféra-, kromoszféra-és koronaképek valamint
SOHO MDI magnetogramok alapján a NOAA 9373 sz. szoláris aktiv vidék fejlődését …