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Abrupt Longitudinal Magnetic Field Changes in Flaring Active Regions
We characterize the changes in the longitudinal photospheric magnetic field during 38 X-class and 39 M-class flares within 65° of disk center using 1 minute GONG magnetograms. In all 77 cases, weExpand
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Solar Magnetic Activity Cycles, Coronal Potential Field Models and Eruption Rates
We study the evolution of the observed photospheric magnetic field and the modeled global coronal magnetic field during the past 3 1/2 solar activity cycles observed since the mid-1970s. We useExpand
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Airborne digital imaging technology: a new overview
This paper presents an overview of current developments in the airborne digital imaging technologies—including both digital frame cameras and pushbroom line scanners—and analyses them in the contextExpand
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A Spatio-temporal Description of the Abrupt Changes in the Photospheric Magnetic and Lorentz-Force Vectors During the 15 February 2011 X2.2 Flare
The active region NOAA 11158 produced the first X-class flare of Solar Cycle 24, an X2.2 flare at 01:44 UT on 15 February 2011. The Helioseismic and Magnetic Imager (HMI) instrument on the SolarExpand
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Coronal Magnetic Field Models
Coronal magnetic field models use photospheric field measurements as boundary condition to model the solar corona. We review in this paper the most common model assumptions, starting from MHD-models,Expand
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Engineering Surveying Technology
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Solar Magnetism in the Polar Regions
This review describes observations of the polar magnetic fields, models for the cyclical formation and decay of these fields, and evidence of their great influence in the solar atmosphere. The polarExpand
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Automated DEM extraction and orthoimage generation from SPOT Level 1B imagery
This paper describes the testing and validation of the photogrammetric modules of the PC1 EASI/PACE system using SPOT stereo-pairs over a high accuracy test field established in a desert area inExpand
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Systematic Oblique Aerial Photography Using Multiple Digital Frame Cameras
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING At the present time, oblique aerial photography enjoys a much higher profi le world-wide than it has done for many years. This is due partly to theExpand
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