10,626 research outputs found
Development of data processing, interpretation and analysis system for remote sensing of trace atmospheric gas species
Highly efficient methods were developed for the analysis and reduction of Measurement of Air Pollution from Satellite (MAPS) data. Specific attention was directed to analyzing the data from the Office of Space and Terrestrial Applications 3 (OSTA-3) correlative measurements of aircraft research flights and from the OSTA-3 shuttle flight. Methods were developed for error analysis of the aircraft and spacecraft instruments. The LSI 11/23 software system was modified and expanded for future data analysis
Computerized data reduction techniques for nadir viewing remote sensors
Computer resources have been developed for the analysis and reduction of MAPS experimental data from the OSTA-1 payload. The MAPS Research Project is concerned with the measurement of the global distribution of mid-tropospheric carbon monoxide. The measurement technique for the MAPS instrument is based on non-dispersive gas filter radiometer operating in the nadir viewing mode. The MAPS experiment has two passive remote sensing instruments, the prototype instrument which is used to measure tropospheric air pollution from aircraft platforms and the third generation (OSTA) instrument which is used to measure carbon monoxide in the mid and upper troposphere from space platforms. Extensive effort was also expended in support of the MAPS/OSTA-3 shuttle flight. Specific capabilities and resources developed are discussed
Evolution of Currents of Opposite Signs in the Flare Productive Solar Active Region NOAA 10930
Analysis of a time series of high spatial resolution vector magnetograms of
the active region NOAA 10930 available from SOT/SP on-board Hinode revealed
that there is a mixture of upward and downward currents in the two foot-points
of an emerging flux-rope. The flux emergence rate is almost the same in both
the polarities. We observe that along with an increase in magnetic flux, the
net current in each polarity increases initially for about three days after
which it decreases. This net current is characterized by having exactly
opposite signs in each polarities while its magnitude remains almost the same
most of the time. The decrease of net current in both the polarities is due to
the increase of current having a sign opposite to that of the net current. The
dominant current, with same sign as the net current, is seen to increase first
and then decreases during the major X-class flares. Evolution of non-dominant
current appears to be a necessary condition for a flare initiation. The above
observations can have a plausible explanation in terms of the superposition of
two different force-free states resulting in non-zero Lorentz force in the
corona. This Lorentz force then push the coronal plasma and might facilitate
the magnetic reconnection required for flares. Also, the evolution of the net
current is found to follow the evolution of magnetic shear at the polarity
inversion line.Comment: 24 pages, 6 figures, Submitted to Astrophysical Journa
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