Dynamics of the Geomagnetic Tail

Abstract

also. For half-lives in the 10~9-to 10~~3-sec range, the same ferromagnetic environment can be used for resonance destruction of the angular distribution. 6 For this range of lifetime one needs to take advantage of the rf-amplitude enhancement in a ferromagnetic lattice while for longer lifetimes this may not be necessary. 7 For conventional spin-rotation measurements in an external magnetic field, the recoil atoms should go into nonmagnetic cubic metals, to avoid as far as possible attenuating interactions. Experiments along these lines are clearly feasible, and preliminary work is in progress.In summary, our results have shown that a large and reasonably uniform degree of alignment is present throughout the neutron and gamma-ray cascades following heavy-ion nuclear reactions. This has been demonstrated to be very useful for spin and multipolarity assignments in spectroscopic studies of the de-exciting product nuclei. It promises to be useful also for studies of the nuclear moments and hyperfine interactions of levels in the product nuclei. Taken together with (1) the wide vari-ety of nuclei that can be produced in compoundnucleus reactions, (2) the broad population of levels in a given product nucleus, and (3) the large uniform recoil velocities of compound nuclei, it makes the use of these reactions a general and powerful tool in nuclear spectroscopy.

Recent progresses in theoretical studies and satellite observations for collisionless magnetic reconnection

“…In the collisionless magnetic reconnection theory developed in early years, the effect of the electron FLR / being the electron gyro-frequency, was taken into account to get rise to the growth rate of an electron tearing mode [7,8]:…”

Tearing stability of a multiscale magnetotail current sheet

“…At the same time, the mechanism of the corresponding plasma instability remains poorly understood. The original mechanism proposed by Coppi et al [1966] was based on the electron tearing instability. In more realistic tail current sheet models Schindler [1974] took into account the finite magnetic field component B z normal to the neutral plane [Fairfield and Ness, 1970], concentrating on ion dynamics.…”

Two‐fluid theory of drift‐kink instability in a one‐dimensional neutral sheet

“…In the early years, the idea of the tearing instability as the mechanism for the onset of substorms became very popular, along with the notion of magnetic reconnection being the primary driver for the explosive energy release during the substorm process [Coppi et al, 1966]. Unfor- 0148-0227/98/98JA-00102509.00…”