Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations

Details Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.2125y&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A2, p. 2125-2136

Astronomy and Astrophysics

Astrophysics

5

Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Sources Of The Solar Wind, Solar Physics, Astrophysics, And Astronomy: Flares, Interplanetary Physics: Interplanetary Dust

Scientific paper

On the basis of the Prognoz 7 selective plasma measurements of α particles and protons the correlations of helium parameters (relative abundance nα/np, velocity difference ΔV=|Vα|-|Vp|, and temperature ratio Tα/Tp) with bulk parameters in different types of solar wind streams are studied. Helium abundance increases with increasing wind velocity in quasi-stationary streams from 1.7+/-2.6% in the heliospheric current sheet (HCS) up to 4.7+/-6.6% in the coronal streamers (CS) and 6.6+/-8.0% in the coronal holes (CH). The maximum value of nα/np of 10.5+/-10.1% is observed in coronal mass ejections (CME) and an intermediate value between HCS and CS 3.4+/-4.2% in the shocked plasma. Helium abundance increases with increasing mass flux and density in streams from CHs and decreases streams from CSs. Velocity difference ΔV increases with increasing velocity in HCS and streams from CSs and CHs, but it is usually small or negative in CMEs and in shocked plasma. The temperature ratio Tα/Tp increases with increasing velocity in the HCS and in streams from CSs, and it is approximately constant in streams from CHs, CMEs, and shocked plasma. No evidence has been obtained that the processes of α particle acceleration differ from each other in streams from CSs and CHs, but they differ from the one in the HCS. In contrast to processes of acceleration, the processes of α particle heating in streams from CHs and CSs are suggested to differ from each other, but they may be the same in streams from CSs and HCS. The value of α particle and proton heating in streams from CHs increases with increasing absolute value of velocity difference of α particles and protons.

Affiliated with

Also associated with

No associations

Rating

Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations 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 Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Helium abundance and dynamics in different types of solar wind streams: The Prognoz 7 observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1604797