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Title: Preconditioning of Interplanetary Space Due to Transient CME Disturbances

Abstract

Interplanetary space is characteristically structured mainly by high-speed solar wind streams emanating from coronal holes and transient disturbances such as coronal mass ejections (CMEs). While high-speed solar wind streams pose a continuous outflow, CMEs abruptly disrupt the rather steady structure, causing large deviations from the quiet solar wind conditions. For the first time, we give a quantification of the duration of disturbed conditions (preconditioning) for interplanetary space caused by CMEs. To this aim, we investigate the plasma speed component of the solar wind and the impact of in situ detected interplanetary CMEs (ICMEs), compared to different background solar wind models (ESWF, WSA, persistence model) for the time range 2011–2015. We quantify in terms of standard error measures the deviations between modeled background solar wind speed and observed solar wind speed. Using the mean absolute error, we obtain an average deviation for quiet solar activity within a range of 75.1–83.1 km s{sup −1}. Compared to this baseline level, periods within the ICME interval showed an increase of 18%–32% above the expected background, and the period of two days after the ICME displayed an increase of 9%–24%. We obtain a total duration of enhanced deviations over about three and up to sixmore » days after the ICME start, which is much longer than the average duration of an ICME disturbance itself (∼1.3 days), concluding that interplanetary space needs ∼2–5 days to recover from the impact of ICMEs. The obtained results have strong implications for studying CME propagation behavior and also for space weather forecasting.« less

Authors:
; ; ;  [1];  [2]
  1. Institute of Physics, University of Graz, Universitätsplatz 5/II, A-8010 Graz (Austria)
  2. Canadian Hazards Information Service, Natural Resources Canada, 2617 Anderson Road, Ottawa, Ontario K1A 0Y3 (Canada)
Publication Date:
OSTI Identifier:
22663951
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 835; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; DISTURBANCES; FORECASTING; HELIOSPHERE; INTERPLANETARY SPACE; MASS; PLASMA; SOLAR WIND; STREAMS; SUN; VELOCITY

Citation Formats

Temmer, M., Reiss, M. A., Hofmeister, S. J., Veronig, A. M., and Nikolic, L., E-mail: manuela.temmer@uni-graz.at. Preconditioning of Interplanetary Space Due to Transient CME Disturbances. United States: N. p., 2017. Web. doi:10.3847/1538-4357/835/2/141.
Temmer, M., Reiss, M. A., Hofmeister, S. J., Veronig, A. M., & Nikolic, L., E-mail: manuela.temmer@uni-graz.at. Preconditioning of Interplanetary Space Due to Transient CME Disturbances. United States. doi:10.3847/1538-4357/835/2/141.
Temmer, M., Reiss, M. A., Hofmeister, S. J., Veronig, A. M., and Nikolic, L., E-mail: manuela.temmer@uni-graz.at. Wed . "Preconditioning of Interplanetary Space Due to Transient CME Disturbances". United States. doi:10.3847/1538-4357/835/2/141.
@article{osti_22663951,
title = {Preconditioning of Interplanetary Space Due to Transient CME Disturbances},
author = {Temmer, M. and Reiss, M. A. and Hofmeister, S. J. and Veronig, A. M. and Nikolic, L., E-mail: manuela.temmer@uni-graz.at},
abstractNote = {Interplanetary space is characteristically structured mainly by high-speed solar wind streams emanating from coronal holes and transient disturbances such as coronal mass ejections (CMEs). While high-speed solar wind streams pose a continuous outflow, CMEs abruptly disrupt the rather steady structure, causing large deviations from the quiet solar wind conditions. For the first time, we give a quantification of the duration of disturbed conditions (preconditioning) for interplanetary space caused by CMEs. To this aim, we investigate the plasma speed component of the solar wind and the impact of in situ detected interplanetary CMEs (ICMEs), compared to different background solar wind models (ESWF, WSA, persistence model) for the time range 2011–2015. We quantify in terms of standard error measures the deviations between modeled background solar wind speed and observed solar wind speed. Using the mean absolute error, we obtain an average deviation for quiet solar activity within a range of 75.1–83.1 km s{sup −1}. Compared to this baseline level, periods within the ICME interval showed an increase of 18%–32% above the expected background, and the period of two days after the ICME displayed an increase of 9%–24%. We obtain a total duration of enhanced deviations over about three and up to six days after the ICME start, which is much longer than the average duration of an ICME disturbance itself (∼1.3 days), concluding that interplanetary space needs ∼2–5 days to recover from the impact of ICMEs. The obtained results have strong implications for studying CME propagation behavior and also for space weather forecasting.},
doi = {10.3847/1538-4357/835/2/141},
journal = {Astrophysical Journal},
number = 2,
volume = 835,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}