Engineering topics
Publications and source records attributed to Arballo, J. K..
In this paper we describe our plans to better understand this phenomenon using TEC measurements from ground and space-borne GPS receivers.
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Polar cap boundary layer waves are ELF/VLF electric and magnetic waves detected on field lines just adjacent to the polar cap. Intense waves are present at this location essentially all (96%) of the time.
A dawn/dusk flank auroral event has been studied using multiple observations of the WIND and POLAR spacecraft, Antarctic all-sky images and Greenland magnetometers.
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We discuss Cassini and the electromagnetic electron and photon cyclotron waves in geospace.
The Cassini spacecraft flew past the Earth in a trajectory almost along the Sun-Earth line, giving a unique perspective of low frequency waves in geospace.
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We statistically analyze many interplanetary shock events where there are both WIND interplanetary data and POLAR UV imaging data. We find that the shock compression events trigger pseudobreakups (PBs), substorm onsets, or enhance (pre-existing) substorm intensities. Using WIND interplanetary data and ground-based data, it is now believed that we can predict when PBs will occur and when substorm expansion phases will occur.
Ten interplanetary WIND shock/ pressure pulse events are used to study the magnetospheric delay of pseudobreakup (PB) or substorm onsets. We identify the PBs and substorms by using the POLAR UV imaging data. The states of the interplanetary medium and the conditions of the ionosphere before and after the auroral brightening onsets are studied. We find that the magnetospheric delay time strongly constrains the location of the nightside X-line during such events. We also find for PB (or no activity) events, that the interplanetary and ionosphere preconditions are unusually low.
We find that small (10-200 rP) magnetic decreases comprise a dominant part of the polar solar wind microstructure at Ulysses distances (2.2 AU). These magnetic field dips are almost always bounded by tangential discontinuities, a feature which is not well understood at this time. Hundreds of these events have been examined in detail and a variety of types have been found. These will be described. It is speculated that these structures have been generated by perpendicular heating of ions closer to the Sun and have then been convected to distances of Ulysses. Such structures may be very important for the rapid cross- field diffusion of ions in the polar regions of the heliosphere.
In this paper we examine the causes of largest magnetic storms at Earth (as measured by Dst). Possible interplanetary mechanisms for the creation of very intense magnetic storms are discussed.
We report four different types of plasma waves detected in the near the dayside polar cap boundary layer (PCBL) region at high altitudes (>6 R***sub E***).
The January 10, 1997 interplanetary pressure pulse (observed at 0053 UT at Wind) caused a dayside aurora, as seen in Polar Ultraviolet Imager (UVI) data, that propagates tailward and to lower L.
The purpose of this paper is to study an interplanetary Bs feature ahead of a magnetic cloud and its related auroral and magnetospheric responses.
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A review of the Interplanetary causes of geomagnetic activity is presented.