Showing papers by "Steven L. Snowden published in 2013"
TL;DR: In this article, the authors used a lobster-eye optics to focus X-rays from a Terrier Mk70 Black Brant IX sounding rocket on the Local Galaxy (DXL) sounding rocket to distinguish the soft X-ray emission due to the Local Hot Bubble (LHB) from that produced via SWCX.
Abstract: The objective of the Di use X-ray emission from the Local Galaxy (DXL) sounding rocket experiment is todistinguish the soft X-ray emission due to the Local Hot Bubble (LHB) from that produced via Solar WindCharge eXchange (SWCX) Enhanced interplanetary helium density in the helium focusing cone provides aspatial variation to the SWCX that can be identi ed by scanning through the focusing cone using an X-rayinstrument with a large grasp DXL consists of two large proportional counters refurbished from the Aerobeepayload used during the Wisconsin All Sky Survey The counters utilize P-10 ll gas and are covered by a thinFormvar window (with Cyasorb UV-24 additive) supported on a nickel mesh DXL's large grasp is 10 cm 2 sr forboth the 14 and 34 keV bands DXL was successfully launched from White Sands Missile Range, New Mexico onDecember 12, 2012 using a Terrier Mk70 Black Brant IX sounding rocketThe Sheath Transport Observer for the Redistribution of Mass (STORM) instrument is a prototype softX-ray camera also successfully own on the DXL sounding rocket STORM uses newly developed slumpedmicropore (`lobster eye') optics to focus X-rays onto a position sensitive, chevron con guration, microchannelplate detector The slumped micropore optics have a 75 cm curvature radius and a polyimide/aluminum lterbonded to its surface STORM's large eld-of-view makes it ideal for imaging SWCX with exospheric hydrogenfor future missions STORM represents the rst ight of lobster-eye optics in spaceKeywords: solar wind charge exchange| local hot bubble | proportional counter | sounding rocket
9 citations
19 Jun 2013
TL;DR: In this article, the inner and outer boundaries of the magnetosheath are detected by using a simulated moving spacecraft (from a range of locations) during a varying solar wind.
Abstract: The solar wind experiences a shock as it approaches Earth's magnetosphere. The region between this shock and the magnetosphere is called the magnetosheath. In this region the solar wind slows down and the solar wind density and temperature increase. This is particularly the case in the sub solar nose of the magnetosheath. This region can clearly be seen in the soft X-ray emission due to charge exchange between heavy solar wind ions and geocoronal neutral hydrogen. The inner and outer boundaries of the magnetosheath are called the magnetopause and the bow shock. These boundaries can easily be seen in the modeled results of solar wind charge exchange (SWCX). The objective of this paper is to show that we can detect these boundaries in the model by using a simulated moving spacecraft (from a range of locations) during a varying solar wind. For this purpose we have created a spacecraft trajectory about 30 RE from Earth and we have used the solar wind data of numerous magneto-hydrodynamic runs.
3 citations