Non-Equilibrium Ionization Modeling of the Current Sheet in a Simulated Solar Eruption Chengcai Shen Co-authors: K. K. Reeves, J. C. Raymond, N. A. Murphy,

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Presentation transcript:

Non-Equilibrium Ionization Modeling of the Current Sheet in a Simulated Solar Eruption Chengcai Shen Co-authors: K. K. Reeves, J. C. Raymond, N. A. Murphy, Y-K. Ko, J. Lin, Z. Mikić

Contents Introduction: CME/flare current sheets Calculation of non-equilibrium ionization Results  Ionization features in current sheets  Predicted SDO/AIA images  Predicted SOHO/UVCS intensity Conclusion

The CME/flare current sheet The current sheet is thin due to the high conductivity. High temperature because of magnetic reconnection heating. High speed magnetic reconnection outflow. Ciaravella et al. 2002Takasao et al UVCS observation (e.g., Ciaravella et al. 2002). LASCO white light observation (e.g., Webb et al. 2003, Ko et al. 2003) XRT observation (e.g., Savage et al. 2010) AIA observation (e.g., Savage et al. 2011, Takasao et al. 2012,)

Time-dependent ionization process Time-dependent ionization processes are important in the current sheet because that the dynamic time scale could be shorter than the ionization time scale. Several recent studies of flares and CMEs have investigated time-dependent ionization process Rakowski et al. (2007) studied the charge state distributions of the ions of various elements in ICMEs. Ko et al. (2010) modeled UV and X- ray emission by considering time- dependent ionization in a steady state Petschek-like reconnection scheme for the post-CME current sheet Lynch et al. (2011) focused on the charge states of several heavy elements in the flux rope using two diﬀerent asymmetric MHD simulations of CME on several AU. Murphy et al. (2011) discussed the consistency between the modeling results and the observation by performing time- dependent ionization analysis. Imada et al. (2011) reported the eﬀects of time- dependent ionization and recombination in magnetic reconnection in the solar corona.

In this work, we focus on time-dependent ionization inside a large scale and dynamically developed CME/flare current sheet. We use the 2.5D simulation results of CME eruption model developed by Reeves et al This model includes Ohmic and coronal heating, thermal conduction, and radiative cooling in the energy equation. The evolution of the CME/flare with time and the distributions of temperature and plasma density around the CME/flare current sheet are known on the 2D plane. (Reeves et al. 2010)

2. Calculation of non-equilibrium ionization

Get history of temperature and density for each plasma cell in the Lagrangian framework. Using a predictor-corrector method, we solve the motion equation and integrate the velocities backwards in time to get the plasma trajectories According to the position of trajectory at different time, get temperature and density through bilinear interpolation in space. Spline interpolation with time. 2. Calculation of non-equilibrium ionization

The calculation process Trajectory in Lagrangian framework History of Temperature & plasma density Ionization & recombination rate (Ci, Ri) Solve: Time- dependent ionization equation Ion charge stateLine Emissivity AIA count rate images UVCS intensity

4. Results The ionization properties of the current sheet Near the low end of the sheet (e.g., point A), the charge state distribution is skewed toward lower charge states compared to equilibrium ionization results. At the top end (point B), on the other hand, the profiles are shifted toward higher charges states Temperature

Results The features of the reconnection inflow and outflow aﬀect the properties of the ionization processes. The current sheet plasma is under-ionized at low heights and over-ionized at large heights. Velocity V y Velocity V x

Results: Predicted AIA images The total AIA count rate includes He, C, N, O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe and Ni. The intensity of the current sheet center is significantly diﬀerent in the non-equilibrium result and the bright thin current sheet region extends higher in the AIA 94Å and 131Å channels.

The intensity profiles along the x-direction across the sheet. For hot AIA channels, the count rates reach the maximum at the center of the sheet. For other channels, the intensity in the center is lower than the background plasma.

The diﬀerence between time-dependent ionization and equilibrium cases depends on height. Define the relative diﬀerence of emission between time-dependent calculations and equilibrium ionization as: Center of the current sheet Outside the current sheet (a) In the lower part of sheet, the intensities are smaller for AIA 94Å & 131Å but larger for other AIA channels. In the higher part of sheet, the case is reversed. (b) In ambient regions, the equilibrium assumption is not appropriate at higher altitude.

Results: Predicted UV intensity Inside the current sheet, the Fe XVIII 975Å profile shows that the maximum peak is located in the center of sheet. The Ca XIV 943Å, Si XII 499Å and O VI 1032Å profiles are less bright.

Predicted UV intensity (b)x=0.012, the temperature increases to around 3x10 6 K in a short period, the time- dependent ionization strongly aﬀects the charge state profiles and causes the appearance of lower temperature (< 3 x 10 6 K) ionization features. A low intensity region surrounds the current sheet. The sheath is deeper in the non-equilibrium results than the equilibrium case. The low intensity sheath feature can be enhanced by the time-dependent ionization process.

A similar low temperature sheath may be found in space observations. For Fe XVIII, the center of the sheet is at a position angle 255 and the low ionization sheath is clear at about PA = 262.

4. Conclusion The current sheet plasma is under-ionized at low heights and over-ionized at large heights. The temperature will be underestimated at low heights and overestimated at large heights by about a factor of 2 if equilibrium is assumed. Non-equilibrium ionization needs to be calculated even at low heights. At low heights in the current sheet, the intensities of the hot AIA channels are lower for non- equilibrium ionization than for equilibrium ionization. At large heights, these intensities are higher for non-equilibrium ionization. Fe XVIII 975Å profile shows that the maximum peak is located in the center of sheet, while the Ca XIV 943Å, Si XII 499Å and O VI 1032Å profiles are less bright at the sheet center. Low intensity regions around the current sheet are found in several UV emission lines (Fe XVIII 975Å and Ca XIV 943Å) and AIA bands. Thank you!