NDLI: On the Statistical Relationship Between CME Speed and Soft X-Ray Flux and Fluence of the Associated Flare

Content Provider	Springer Nature Link
Author	Salas Matamoros, C. Klein, K. L.
Copyright Year	2015
Abstract	Observation and theory both reveal a close relationship between the kinematics of coronal mass ejections (CMEs) and the thermal energy release traced by the related soft X-ray (SXR) emission. A major problem of empirical studies of this relationship is the distortion of the CME speed by the projection effect in the coronagraphic measurements. We present a re-assessment of the statistical relationship between CME velocities and SXR parameters using the SOHO/LASCO catalog and GOES whole-Sun observations during the period 1996 to 2008. Forty-nine events were identified in which CMEs originated near the limb, at central meridian distances between 70$^{∘}$ and 85$^{∘}$, and had a reliably identified SXR burst, the parameters of which – peak flux and fluence – could be determined with some confidence. We find similar correlations between the logarithms of CME speed and of SXR peak flux and fluence as several earlier studies, with correlation coefficients of 0.48 for the flux and 0.58 for the fluence. Correlations are slightly improved over an unrestricted CME sample when only limb events are used. However, a broad scatter persists. We derive the parameters of the CME–SXR relationship and use them to predict ICME arrival times at Earth. We show that the CME speed inferred from SXR fluence measurements tends to perform better than SoHO/LASCO measurements in predicting ICME arrival times near 1 AU. The estimation of the CME speed from SXR observations can therefore make a valuable contribution to space weather predictions.
Starting Page	1337
Ending Page	1353
Page Count	17
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	290
Issue Number	5
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-04-10
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coronal mass ejections Interplanetary coronal mass ejections Flares X-ray bursts Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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