Streamer disconnection events observed with the LASCO coronagraph

Time Domain Analysis of Polar Plumes Observed with the LASCO/SOHO Coronagraph

The polar regions of the solar corona exhibit during solar minima very faint ray-like structures which apparently outline the lines of polar magnetic field. Usually they are named plumes in the solar coronal literature. In order to understand the spatiotemporal characteristics of these plumes we analyze a sequence of 400 continuous observations covering a period of 3 days. For such analysis we ...

ENHANCEMENT OF LASCO Cl , C 2 , AND C 3 CORONAGRAPH

Climatologies of streamer events

Climatologies of streamer events derived from a transport model and a coupled chemistry-climate model V. Eyring, M. Dameris, V. Grewe, I. Langbein, and W. Kouker DLR Institut für Physik der Atmosphäre, Oberpfaffenhofen, D-82234 Wessling, Germany Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung, 76344 Eggenstein-Leopoldshafen, Germany Received: 17 October 2002 – Accepted...

In-Orbit Calibration of the Distortion of the SOHO/LASCO-C2 Coronagraph

This paper describes distortion calibration procedures for the SOHO/LASCO-C2 Coronagraph, based on in-orbit data and extensive image processing methods. It addresses specific problems of externally occulted coronagraphs (obstructed center of field-of-view, strong vignetting, and presence of stray light) and limitations inherent to space-based instrumentation (cosmic rays and limited number of r...

Update of the Photometric Calibration of the LASCO-C2 Coronagraph Using Stars

We present an update to the photometric calibration of the LASCO-C2 coronagraph onboard the SOHO spacecraft. We obtained the new calibration using data from the beginning of the mission in 1996 until 2013. We re-examined the LASCO-C2 photometric calibration by comparing the past three calibrations and the present calibration with the goal of validating an in-flight calibration. We find a photom...