Comparison of coronal electron density distributions from MLSO/MK4, STEREO/SECCHI-COR1, SOHO/LASCO-C2, and SOHO/UVCS
Abstract
The coronal electron density is a fundamental and important physical quantity in solar physics. In this study, we compare coronal electron density distributions (CEDDs) derived from polarized brightness (pB) observations (MLSO/MK4 coronameter, STEREO/SECCHI-COR1 and SOHO/LASCO-C2 Coronagraphs) and one spectroscopic observation (SOHO/UVCS). For this, we consider data from January to August 2007 with the following conditions: the separation angle between the either of the STEREO spacecraft and Earth is less than 10 degrees and the observation time differences from one another are less than 1 minutes. In the pB observations, the CEDDs can be estimated by using inversion methods (Van de Hulst inversion for MK4 and LASCO-C2 pB data, and spherically symmetric polynomial approximation inversion for COR1 pB data). In the spectroscopic observation, we use the ratio of radiative and collisional components of the O vi doublet (O vi 1032 Å and 1037.6 Å) to estimate the CEDDs. We will show you some results about the estimated CEDDs and their dependence on different coronal regions such as backgournd corona and streamers.
- Publication:
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AAS/Solar Physics Division Abstracts #48
- Pub Date:
- August 2017
- Bibcode:
- 2017SPD....4810635L