Propagation of MRT Unstable Plasma Spikes in the Inter-planetary Space
aa r X i v : . [ a s t r o - ph . S R ] J un Propagation of MRT Unstable Plasma Spikes in theInter-planetary Space
Sudheer K. MishraDepartment of Physics, Indian Institute of Technology (BHU), Varanasi-221005, India.Talwinder SinghDepartment of Space Science, University of Alabama in Huntsville, Huntsville AL35899,USAP. KayshapUMCS, Group of Astrophysics, UMCS, ul. Radziszewskiego 10, 20-031, Lublin, PolandA.K. SrivastavaDepartment of Physics, Indian Institute of Technology (BHU), Varanasi-221005, IndiaReceived ; accepted 2 –
ABSTRACT
We have used the Coronagraphic and Heliospheric Imaging data from SolarTErrestrial RElations Observatory (STEREO) to observe a prominence whichis erupted on June 7 th
1. Introduction
The formation of plumes and fragmentation in an eruptive prominence may beoccurred due to the magnetic Rayleigh-Taylor instability (Hillier 2018). A prominenceeruption occurred on June 7 th
2. Observational Data and Analysis
Coronagarphs (COR-1A & COR-2A, Howard et al. 2008) and Heliospheric Imagers(HI-1A & HI-2A, Howard et al. 2008) onboard STEREO have been used to observe theprominence eruption occurred from the NOAA AR 11226/11227 on June 7 th
3. Result and Discussion
A prominence has been erupted on June 7 th th B = B x ˆi + B y ˆj ) developed between the finger structure andcorresponding below lying dark region. The magnetic interface is parallel to the wavevelocity perturbation triggering MRT instability. A density gradient works towards the Suncenter in the direction of the gravity (Fig. 1; left panel). The tension component of theLorentz force accelerates the MRT unstable plasma segment against the gravity and densitygradient (Fig. 1; left panel). It is observed that these MRT unstable finger structuresfurther change there morphological shape i.e., fingers → mushroom-like → plasma spikes,with the decreasing magnetic field into the outer solar atmosphere. (Mishra et al. 2018).The plasma spikes are evolved in the low-interplanetary space due to turbulent mixingof the MRT unstable plasma structures erupting from the Sun (Mishra et al. 2018). Thetransport of this eruptive prominence upto 1.0 A.U. has reported by Wood et al.(2015). Inthe present paper, we find that the eruptive prominence is MRT unstable which propagatesin form of plasma spikes into the inter-planetary space (cf., Figs 2, left-panel, spikesS1& S2). The schematic (Fig. 2, right-panel) demonstrates the modified scenario of thepropagation of various ejecta in the interplanetary space. It includes the formation of 4 –localized MRT unstable plasma spikes that can slide along the inter-planetary magneticfield and can carry their own magneto-plasma system. These unstable plasma spikesimping around the Earth at 1 A.U. (Fig. 3). If such MRT unstable plasma structures movecollectively and interact with the Earth’s outer atmosphere then they can generate theepisodic geomagnetic storm and can act as a new space weather candidate. 5 –Fig. 1.— Right: Partial field of view of COR-1 onboard STEREO-A that shows the MRT un-stable fingers in the eruptive prominence at June 7 th Earth
S1 S2 HI-2AA HI-1A Cor2-A 2011-06-09 12:09
REFERENCES