103 citations · 653 across the 20 of their papers we have counts for
20 papers
Irregular proton injection to high energies at interplanetary shocks
Domenico Trotta, Timothy S. Horbury, David Lario +8
How thermal particles are accelerated to suprathermal energies is an unsolved issue, crucial for many astrophysical systems. We report novel observations of irregular, dispersive e…
Three-dimensional modelling of the shock-turbulence interaction
Domenico Trotta, Oreste Pezzi, David Burgess +12
The complex interaction between shocks and plasma turbulence is extremely important to address crucial features of energy conversion in a broad range of astrophysical systems. We s…
Single-spacecraft techniques for shock parameters estimation: A systematic approach
Domenico Trotta, Laura Vuorinen, Heli Hietala +8
Spacecraft missions provide the unique opportunity to study the properties of collisionless shocks utilising in situ measurements. In the past years, several diagnostics have been…
Multi-spacecraft observations of shocklets at an interplanetary shock
Domenico Trotta, Heli Hietala, Timothy Horbury +5
Interplanetary (IP) shocks are fundamental building blocks of the heliosphere, and the possibility to observe them \emph{in-situ} is crucial to address important aspects of energy…
On the transmission of turbulent structures across the Earth's Bow Shock
Domenico Trotta, Francesco Pecora, Adriana Settino +7
Collisionless shocks and plasma turbulence are crucial ingredients for a broad range of astrophysical systems. The shock-turbulence interaction, and in particular the transmission…
Interplanetary Shock-induced Magnetopause Motion: Comparison between Theory and Global Magnetohydrodynamic Simulations
Ravindra T. Desai, Mervyn P. Freeman, Jonathan P. Eastwood +10
The magnetopause marks the outer edge of the Earth's magnetosphere and a distinct boundary between solar wind and magnetospheric plasma populations. In this letter, we use global m…
Direct Multipoint Observations Capturing the Reformation of a Supercritical Fast Magnetosonic Shock
D. L. Turner, L. B. Wilson, K. A. Goodrich +12
Using multipoint Magnetospheric Multiscale (MMS) observations in an unusual string-of-pearls configuration, we examine in detail observations of the reformation of a fast magnetoso…
Enhanced proton parallel temperature inside patches of switchbacks in the inner heliosphere
L. D. Woodham, T. S. Horbury, L. Matteini +16
Switchbacks are discrete angular deflections in the solar wind magnetic field that have been observed throughout the heliosphere. Recent observations by Parker Solar Probe (PSP) ha…
Electron acceleration by magnetosheath jet-driven bow waves
Terry Z. Liu, Heli Hietala, Vassilis Angelopoulos +2
Magnetosheath jets are localized fast flows with enhanced dynamic pressure. When they supermagnetosonically compress the ambient magnetosheath plasma, a bow wave or shock can form…
Statistical study of magnetosheath jet-driven bow waves
Terry Z. Liu, Heli Hietala, Vassilis Angelopoulos +3
When a magnetosheath jet (localized dynamic pressure enhancements) compresses ambient magnetosheath at a (relative) speed faster than the local magnetosonic speed, a bow wave or sh…
Magnetohydrodynamic with embedded particle-in-cell simulation of the Geospace Environment Modeling dayside kinetic processes challenge event
Yuxi Chen, Gabor Toth, Heli Hietala +7
We use the MHD with embedded particle-in-cell model (MHD-EPIC) to study the Geospace Environment Modeling (GEM) dayside kinetic processes challenge event at 01:50-03:00 UT on 2015-…
Radiation Monitor RADMON aboard Aalto-1 CubeSat: First results
Jan Gieseler, Philipp Oleynik, Heli Hietala +12
The Radiation Monitor (RADMON) on-board Aalto-1 CubeSat is an energetic particle detector that fulfills the requirements of small size, low power consumption and low budget. Aalto-…
Calibration of RADMON Radiation Monitor Onboard Aalto-1 CubeSat
Philipp Oleynik, Rami Vainio, Arttu Punkkinen +11
RADMON is a small radiation monitor designed and assembled by students of the University of Turku and the University of Helsinki. It is flown on-board Aalto-1, a 3-unit CubeSat in…
FORESAIL-1 cubesat mission to measure radiation belt losses and demonstrate de-orbiting
FORESAIL collaboration, M. Palmroth, J. Praks +57
Today, the near-Earth space is facing a paradigm change as the number of new spacecraft is literally sky-rocketing. Increasing numbers of small satellites threaten the sustainable…
Direct observations of a surface eigenmode of the dayside magnetopause
M. O. Archer, H. Hietala, M. D. Hartinger +2
The abrupt boundary between a magnetosphere and the surrounding plasma, the magnetopause, has long been known to support surface waves. It was proposed that impulses acting on the…
Dayside magnetospheric and ionospheric responses to a foreshock transient on June 25, 2008: 2. 2-D evolution based on dayside auroral imaging
Boyi Wang, Yukitoshi Nishimura, Heli Hietala +8
The foreshock region involves localized and transient structures such as foreshock cavities and hot flow anomalies due to solar wind-bow shock interactions, and foreshock transient…
Different types of ion populations upstream of the 8 October 2013 interplanetary shock
Primoz Kajdic, Heli Hietala, Xochitl Blanco Cano
We show for the first time that different types of suprathermal ion distributions may exist upstream of a single interplanetary shock. ACE and the two ARTEMIS satellites observed a…
Fermi acceleration of electrons inside foreshock transient cores
Terry Z. Liu, San Lu, Vassilis Angelopoulos +2
Foreshock transients upstream of Earth's bow shock have been recently observed to accelerate electrons to many times their thermal energy. How such acceleration occurs is unknown,…
Statistical study of particle acceleration in the core of foreshock transients
Terry Z. Liu, Vassilis Angelopoulos, Heli Hietala +1
Several types of foreshock transients upstream of Earth's bow shock possessing a tenuous, hot core have been observed and simulated. Because of the low dynamic pressure in their co…
Injection of thermal and suprathermal seed particles into coronal shocks of varying obliquity
Markus Battarbee, Rami Vainio, Timo Laitinen +1
Context: Diffusive shock acceleration in the solar corona can accelerate solar energetic particles to very high energies. Acceleration efficiency is increased by entrapment through…