Browsing UMBC Goddard Planetary Heliophysics Institute (GPHI) by Title
Now showing items 1-15 of 15
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The 04 – 10 September 2017 Sun–Earth Connection Events: Solar Flares, Coronal Mass Ejections/Magnetic Clouds, and Geomagnetic Storms
(Springer Netherlands, 2019-08-23)In early September 2017, a series of solar flares and coronal mass ejections (CMEs) erupted from the Sun. The Cor2a coronagraph, a unit of the Sun Earth Connection Coronal and Heliospheric Investigation (SECCHI), onboard ... -
Developing the Physical Understanding of Intermediate Polars: An X-Ray Study of TV Col and V2731 Oph
(IOP Publishing, 2019-08-02)The X-rays in intermediate polars (IPs) originate in a compact region near the surface of a magnetic white dwarf (WD) and interact with the complex environment surrounding the emission region. Here we report a case study ... -
Electron vorticity indicative of the electron diffusion region of magnetic reconnection
(American Geophysical Union, 2019-06-27)Abstract While vorticity defined as the curl of the velocity has been broadly used in fluid and plasma physics, this quantity has been underutilized in space physics due to low time resolution observations. We report ... -
EMIC waves converted from equatorial noise due to M/Q = 2 ions in the plasmasphere: Observations from Van Allen Probes and Arase
(American Geophysical Union, 2019-06-07)Abstract Equatorial noise (EN) emissions are observed inside and outside the plasmapause. EN emissions are referred to as magnetosonic mode waves. Using data from Van Allen Probes and Arase, we found conversion from EN ... -
Geomagnetically induced currents caused by interplanetary shocks with different impact angles and speeds
(AGU, 2018-05-15)The occurrence of geomagnetically induced currents (GICs) poses serious threats to modern technological infrastructure. Large GICs result from sharp variations of the geomagnetic field (dB/dt) caused by changes of large‐scale ... -
How do interplanetary shock impact angles control the size of the geoeffective magnetosphere
(Elsevier Ltd, 2018-09-09)In this paper, we investigate temporal and spatial magnetosphere response to the impact of interplanetary (IP) shocks with different inclinations and speeds on the Earth’s magnetosphere. A data set with more than 500 IP ... -
J-PLUS: Two-dimensional analysis of the stellar population in NGC 5473 and NGC 5485
(ESO, 2019-01-12)Context. The spatial variations of stellar population properties within a galaxy are intimately related to their formation process. Therefore, spatially resolved studies of galaxies are essential to uncover their formation ... -
A Magnetic Pressure Front Upstream of the Heliopause and the Heliosheath Magnetic Fields and Plasma, Observed during 2017
(IOP Publishing, 2019-05-21)Voyager 1 (V1), moving in the interstellar magnetic field, observed an increase in the daily averages of B beginning on day ≈346, 2016, rising to a local maximum on day ≈382, and declining nearly monotonically for the ... -
Orbital Maintenance for the Wide Field Infrared Survey Telescope: The Effects of Solar Radiation Pressure and Navigation Accuracies on Station Keeping
(2018-08-19)The Wide-Field Infrared Survey Telescope (WFIRST), a NASA observatory designed to investigate dark energy and astrophysics, is planned for a launch in 2025 to orbit the Sun-Earth L2 (SEL2) Libration Point. Due to the ... -
Solar Radiation Pressure Effects on the Orbital Motion at SEL2 for the James Webb Space Telescope
(NASA Technical Reports Server, 2019-08-11)Due to James Webb Space Telescope’s large sunshield, which will always be facing the Sun to protect the observatory’s instruments, Solar Radiation Pressure (SRP) has an important effect on its orbital motion around SEL2. ... -
Statistical survey of the terrestrial bow shock observed by the Cluster spacecraft
(American Geophysical Union, 2019-02-13)The terrestrial bow shock provides us with a unique opportunity to extensively investigate properties of collisionless shocks using in situ measurements under a wide range of upstream conditions. Here we report a statistical ... -
Understanding the Role of α Particles in Oblique Heliospheric Shock Oscillations
(American Geophysical Union, 2019-04-08)Recent observations by DSCOVR provide high temporal resolution (50 samples per second) magnetic vector field data that allows investigating the details of oblique heliospheric shock oscillations. It was found that some of ... -
Using mutual information to determine geoeffectiveness of solar wind phase fronts with different front orientations
(American Geophysical Union, 2019-02-04)The geoeffectiveness of solar wind shocks depends on angle with respect to the Sun‐Earth line, with highly angled solar wind shocks being less geoeffective than nearly frontal solar wind shocks. However, it is unclear ... -
WIDE-FIELD INFRARED SURVEY TELESCOPE AND STARSHADE FORMATION FLYING DYNAMICS AT SUN-EARTH L2
(2018)The formation flying of an occulter with a telescope at the Sun-Earth L2 (SEL2) Libration Point can be a challenging problem. A good knowledge of the Restricted Three Body Problem dynamics is required to understand how ... -
WIDE-FIELD INFRARED SURVEY TELESCOPE AND STARSHADE FORMATION FLYING DYNAMICS AT SUN-EARTH L2
(2018-10-01)The formation flying of an occulter with a telescope at the Sun-Earth L2 (SEL2) Libration Point can be a challenging problem. A good knowledge of the Restricted Three Body Problem dynamics is required to understand how ...