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Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow
Roth, Markus; Jackiewicz, Jason; Kholikov, Shukur +1 more
Accurate measurements of deep solar meridional flow are of vital interest for understanding the solar dynamo. In this paper, we validate a recently developed method for obtaining sensitivity functions (kernels) for travel-time measurements to solar interior flows using the Born approximation in spherical geometry, which is expected to be more accu…
A study of ionopause perturbation and associated boundary wave formation at Venus
Zhang, Tielong; Collinson, Glyn A.; Chong, Ghai Siung +3 more
Magnetometer and electron spectrometer data from Venus Express (VEX) are used to investigate the occurrence of boundary wave phenomenon occurring in the vicinity of the Venusian terminator. On 26 June 2006, VEX data show the ionosphere to be unmagnetized (≈0 nT), a common observation usually expected during solar maximum. This results in the respe…
Deconstructing a galaxy: colour distributions of point sources in Messier 83
Barmby, P.; Kiar, A. K.; Hidalgo, A.
What do we see when we look at a nearby, well-resolved galaxy? Thousands of individual sources are detected in multiband imaging observations of even a fraction of a nearby galaxy, and characterizing those sources is a complex process. This work analyses a ten-band photometric catalogue of nearly 70 000 point sources in a 7.3 square arcmin region …
Supernova remnants in the Magellanic Clouds
Bozzetto, L. M.; Filipovic, M. D.
We present initial results of an ongoing study of the supernova remnants (SNRs) and candidates in the Magellanic Clouds. Some 108 objects in both Clouds are considered to be either an SNR or a reliable candidate. This represents the most complete sample of known SNRs in any galaxy. therefore, this study allows us to study SNR population properties…
Double-cusp simulation during northward IMF using 3D PIC global code
Esmaeili, Amin; Kalaee, Mohammad Javad
The cusp has important effects on the transportation of particles and their energy from the solar wind to the magnetosphere, and ionosphere, and high-altitude atmosphere. The cusp can be considered to be a part of the magnetospheric boundary layer with weaker magnetic fields. It has been studied since 1971 by different satellite observations. Desp…
Quasi-periodic Pulse Amplitude Modulation in the Accreting Millisecond Pulsar IGR J00291+5934
van der Klis, Michiel; Bult, Peter; van Doesburgh, Marieke
We introduce a new method for analyzing the aperiodic variability of coherent pulsations in accreting millisecond X-ray pulsars (AMXPs). Our method involves applying a complex frequency correction to the time-domain light curve, allowing for the aperiodic modulation of the pulse amplitude to be robustly extracted in the frequency domain. We discus…
Observations of V0332+53 during the 2015 outburst using Fermi/GBM, MAXI, Swift and INTEGRAL
Rodi, James; Cherry, Michael L.; Baum, Zachary A.
We present the light curves, spectra and hardness-intensity diagram (HID) of the high-mass X-ray binary V0332+53 using Fermi/GBM, MAXI, Swift/BAT and INTEGRAL through its 2015 Type II outburst. We observe characteristic features in the X-ray emission (2-50 keV) due to periastron passages, the dynamical time-scale of the accretion disc, and changes…
Peak flux of flares associated with coronal mass ejections
Suryanarayana, Gadikere Sheshagiriyappa; Balakrishna, Kagalagodu Manjunathayya
Features of flares that occur in association with coronal mass ejections (CMEs) have often displayed variations compared to flares with no associated CMEs. A comparative estimation of peak flux values of flares associated with CMEs and those without CMEs is made. Peak flux values of flares associated with CMEs show distinctly higher values in comp…
Localization of whistler wave and turbulent spectra in the magnetotail region
Sharma, R. P.; Pathak, Neha; Sharma, Swati +2 more
Observations show that whistler waves play a very crucial role both in magnetic reconnection and turbulence. In this context, linear and nonlinear dynamical equations of whistler wave have been derived and further these equations have been solved numerically as well as semianalytically. For application purpose, magnetotail parameters have been cho…
Stellar X‑ray accretion signatures
Robrade, J.; Günther, H. M.; Schneider, P. C.