Explaining GRB in the light of energy deposition rate for v+ % MathType!MTEF!2!1!+- % feaagaart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGafqyVd4Mbae % baaaa!37BD! $$ \bar \nu $$ → e + + e − in a compact star

I have developed two-dimensional general relativistic magnetohydrodynamic (GRMHD) code. I have performed numerical simulations of collapsars using these codes and realistic progenitor models. In the GRMHD simulation, it is shown that a jet is launched from the center of the progenitor. We also performed two-dimensional hydrodynamic simulations in the context of collapsar model to investigate the explosive nucleosynthesis happened there. It is found that the amount of 56 Ni is very sensitive to the energy deposition rate. This result means that the amount of synthesized 56 Ni can be little even if the total explosion energy is as large as 1052 erg. Thus, some GRBs can associate with faint supernovae. Thus we consider it is quite natural to detect no underlying supernova in some X-ray afterglows.

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Effect of energy deposition rate on plasma expansion characteristics and nanoparticle generation by electrical explosion of conductors

High Energy Density Physics ◽

10.1016/j.hedp.2015.10.002 ◽

2015 ◽

Vol 17 ◽

pp. 270-276 ◽

Cited By ~ 6

Author(s):

Somanand Sahoo ◽

Alok K. Saxena ◽

Trilok C. Kaushik ◽

Satish C. Gupta

Keyword(s):

Deposition Rate ◽

Energy Deposition ◽

Electrical Explosion ◽

Plasma Expansion ◽

Energy Deposition Rate ◽

Nanoparticle Generation

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Electromagnetic energy deposition rate in the polar upper thermosphere derived from the EISCAT Svalbard radar and CUTLASS Finland radar observations

Annales Geophysicae ◽

10.5194/angeo-25-2393-2007 ◽

2007 ◽

Vol 25 (11) ◽

pp. 2393-2403 ◽

Cited By ~ 6

Author(s):

H. Fujiwara ◽

R. Kataoka ◽

M. Suzuki ◽

S. Maeda ◽

S. Nozawa ◽

...

Keyword(s):

Electric Field ◽

Deposition Rate ◽

Energy Deposition ◽

Electromagnetic Energy ◽

Soft Particle ◽

Small Contribution ◽

Polar Cap ◽

Radar Observations ◽

Cusp Region ◽

Energy Deposition Rate

Abstract. From simultaneous observations of the European incoherent scatter Svalbard radar (ESR) and the Cooperative UK Twin Located Auroral Sounding System (CUTLASS) Finland radar on 9 March 1999, we have derived the height distributions of the thermospheric heating rate at the F region height in association with electromagnetic energy inputs into the dayside polar cap/cusp region. The ESR and CUTLASS radar observations provide the ionospheric parameters with fine time-resolutions of a few minutes. Although the geomagnetic activity was rather moderate (Kp=3+~4), the electric field obtained from the ESR data sometimes shows values exceeding 40 mV/m. The estimated passive energy deposition rates are also larger than 150 W/kg in the upper thermosphere over the ESR site during the period of the enhanced electric field. In addition, enhancements of the Pedersen conductivity also contribute to heating the upper thermosphere, while there is only a small contribution for thermospheric heating from the direct particle heating due to soft particle precipitation in the dayside polar cap/cusp region. In the same period, the CUTLASS observations of the ion drift show the signature of poleward moving pulsed ionospheric flows with a recurrence rate of about 10–20 min. The estimated electromagnetic energy deposition rate shows the existence of the strong heat source in the dayside polar cap/cusp region of the upper thermosphere in association with the dayside magnetospheric phenomena of reconnections and flux transfer events.

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