منابع مشابه
Evershed Clouds as Precursors of Moving Magnetic Features around Sunspots
The relation between the Evershed flow and moving magnetic features (MMFs) is studied using highcadence, simultaneous spectropolarimetric measurements of a sunspot in visible (630.2 nm) and near-infrared (1565 nm) lines. Doppler velocities, magnetograms, and total linear polarization maps are calculated from the observed Stokes profiles. We follow the temporal evolution of two Evershed clouds t...
متن کاملFlow patterns around old sunspots and flare activity
Newmagnetic flux emerges significantly more probably in already existing solar active regions. Based on the the Debrecen Observatory photographic observations, several active regions are collected, where at least one large, X-class flare was recorded, and emergence of new activity, birth and quick motion of new umbrae was observed in the vicinity of old spots, the new activity emerged in the ce...
متن کاملFine structure in sunspots II. Intensity variations and proper motions of umbral dots
Temporal intensity variations of umbral dots (UDs) and dark nuclei (DNs), and proper motions of UDs, were analyzed in a 4 1/2 hour time series of high resolution white light images of the umbra in a medium-size sunspot (NOAA 7519). The observationsweremade on 5 June 1993 at the SwedishVacuum Solar Telescope, La Palma. An identification and tracking algorithm was applied to UDs observed in a des...
متن کاملMeasurements of Plasma Motions in Dynamic Fibrils
We present a 40 minute time series of filtergrams from the red and the blue wing of the Hα line in an active region near the solar disk center. From these filtergrams we construct both Dopplergrams and summed “line center” images. Several dynamic fibrils (DFs) are identified in the summed images. The data is used to simultaneously measure the proper motion and the Doppler signals in DFs. For ca...
متن کاملSunspots in the Laboratory
We show that extrinsic or non-fundamental uncertainty influences markets in a controlled environment. This work provides the first direct evidence of sunspot equilibria. These equilibria require a common understanding of the semantics of the sunspot variable, and they appear to be sensitive to the flow of information. Extrinsic uncertainty matters when information flows slowly, as in a call mar...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1993
ISSN: 0252-9211
DOI: 10.1017/s0252921100028736