Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities

Details Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities

2011-11-17

arxiv.org/abs/1111.4000v1

The Astrophysical Journal, 727:44, 2011

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Scientific paper

10.1088/0004-637X/727/1/44

We investigate the relationship between the monthly averaged maximal speeds of coronal mass ejections (CMEs), international sunspot number (ISSN), and the geomagnetic Dst and Ap indices covering the 1996-2008 time interval (solar cycle 23). Our new findings are as follows. (1) There is a noteworthy relationship between monthly averaged maximum CME speeds and sunspot numbers, Ap and Dst indices. Various peculiarities in the monthly Dst index are correlated better with the fine structures in the CME speed profile than that in the ISSN data. (2) Unlike the sunspot numbers, the CME speed index does not exhibit a double peak maximum. Instead, the CME speed profile peaks during the declining phase of solar cycle 23. Similar to the Ap index, both CME speed and the Dst indices lag behind the sunspot numbers by several months. (3) The CME number shows a double peak similar to that seen in the sunspot numbers. The CME occurrence rate remained very high even near the minimum of the solar cycle 23, when both the sunspot number and the CME average maximum speed were reaching their minimum values. (4) A well-defined peak of the Ap index between 2002 May and 2004 August was co-temporal with the excess of the mid-latitude coronal holes during solar cycle 23. The above findings suggest that the CME speed index may be a useful indicator of both solar and geomagnetic activities. It may have advantages over the sunspot numbers, because it better reflects the intensity of Earth-directed solar eruptions.

Affiliated with

Also associated with

No associations

Rating

Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Maximum Coronal Mass Ejection Speed as an Indicator of Solar and Geomagnetic Activities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-349132