The RHESSI mission includes precise astrometric measurements of the solar limb shape at optical wavelengths as a part of its aspect-determination system. These data have precisions below 1 mas and extend over the full lifetime of the mission (from February, 2002). Synoptic maps of the limb shape reveal facular regions as increases, and sunspots as decreases, in the apparent radius. We compare t...

Setting priorities for protection and restoration efforts is necessary whenever resources are not sufficient to target all sites simultaneously. When this occurs priorities should be set to maximize the ecological benefit gained from available resources. Prioritizing protection and restoration efforts in this fashion is hampered, however, by a lack of information that can be used by resource ma...

We report on the development and validation of a neural network (NN) model of PM10 concentrations in terms of photochemical measurements of NO, NO2 and O3 and temporal parameters that include the day of the week and the day of the year with its sinusoidal variation. A long-term record (≈10 yr) from 2001–2012 (inclusive) assembled from measurements taken at 10 station nodes in the air quality mo...

Aerosol formation over the Boreal forest in Hyytiälä, Finland: monthly frequency and annual cycles – the roles of air mass characteristics and synoptic scale meteorology E. D. Nilsson and M. Kulmala Stockholm University, Department of Applied Environmental Science, 10691 Stockholm, Sweden University of Helsinki, Department of Physical Sciences, P.O. Box 64, 00014 Helsinki, Finland Received: 29 ...

This paper applies some recent methods involving semantic vectors and their combination operations to some very traditional questions, including the discovery of similarities and differences between the four Gospels, relationships between individuals, and the identification of geopolitical regions and leaders in the ancient world. In the process, we employ several methods from linear algebra an...

Distortions are often seen in the angular distribution of echo-power from VHF wind-profiling radars, suggesting that thin stable layers, within the air flow, are distorted and tilted from horizontal. In vertical shear of the horizontal wind, the distribution of the layer tilt angles becomes skewed. A case study using six days of VHF radar data and synoptic charts above western Europe indicates ...

opsis of all flow features simultaneously. Good examples of 2D synoptic visualizations are weather maps from both TV news reports and online Web pages. The human visual system is adept at finding patterns within larger contexts, and we hypothesize that synoptic visualization methods will help users find unexpected features more quickly and thus speed the understanding of complex 3D time-varying...