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2012

Prediction of anomalous cosmic ray intensities near Earth

September 24, 2012

The figure illustrates many of the important features of the solar modulation of anomalous cosmic rays (ACRs) and also gives us a forecast for the coming years. Panel (a) shows the intensity of ACR O at 1 AU as measured by a variety of observers over the last 30 years. The SAMPEX measurements are the […]

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Space weather May 98

September 24, 2012

During May there were several spacecraft anomalies: Equator-S stopped transmitting data on May 1 Polar suffered an anomaly May 6 that stopped its processor PanAmSat’s Galaxy-4 failed May 19, disrupting paging and other communications services in the U.S. The Polar spacecraft anomaly coincided with the rise phase of an solar energetic particle event on May […]

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NOy: solar coupling

September 24, 2012

A significant coupling has been proposed to exist between solar activity, energetic electron precipitation (EEP) from the magnetosphere into the atmosphere followed by NOy formation with its transport to the stratosphere possibly altering stratospheric O3. The verification of this solar-terrestrial coupling requires three essential findings. (1) Show that precipitating electrons respond to solar forcing, in […]

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Long term variation in the flux of low altitude quasi-trapped equatorial ions

September 24, 2012

The LICA ion spectrometer on SAMPEX routinely detects quasi-trapped protons near the magnetic equator. Such low-altitude, equatorial ions first were observed by Moritz (1972) and Hovestadt et al. (1972) with instruments on the Azur satellite. The ions typically have pitch angles near 90 degrees, because more field-aligned ions are rapidly lost to collisions with the […]

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Global coherence of electron enhancements in the magnetosphere

September 24, 2012

Several magnetic cloud/CME events have been observed during the 1997-98 time period, as we approach the maximum of the next solar cycle. Multiple spacecraft have observed for the first time the evolution of these events from their origin to passage over the magnetosphere. We have studied the magnetospheric outer zone energetic electron response to these […]

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SAMPEX observes correlation between precipitating electrons and geomagnetic indices

September 24, 2012
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New Measurements of High Energy Solar Particle Charge States

September 24, 2012
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ACR Solar Cycle dependence

September 24, 2012
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Radiation belt electrons: magnetic storm of 1997

September 24, 2012
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Ultra-relativistic electron radiation belt

September 24, 2012
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Trapped ACR: Low energy Argon

September 24, 2012
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SEP events: MAST measurements

September 24, 2012
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Relativistic electrons: Long term measurements

September 24, 2012
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Transient Proton radiation belts

September 24, 2012
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Odd Nitrogen and electron precipitation

September 24, 2012
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Heliospheric Current Sheet Tilt model

September 24, 2012
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Geomagnetic cutoffs during SEP events

September 24, 2012
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ACR Ionic Charge States

September 24, 2012
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Time variability of Geomagnetic Cutoffs

September 24, 2012
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Relativistic Electrons and Solar Wind

September 24, 2012
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Extremely quiet Solar Wind conditions

September 24, 2012
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More observations of the magnetosphere under conditions of low-density solar wind

September 24, 2012
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The outer radiation belt as seen with protons: a new view with SAMPEX

September 24, 2012
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Solar Cycle Dependence of the Geomagnetically Trapped Anomalous Cosmic Rays

September 24, 2012
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Large Solar Disturbances and Their Geospace Consequences: SAMPEX, SNOE, and POLAR Correlative Observations

September 24, 2012
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The solar particle event of Friday, July 14, 2000

September 24, 2012
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More on the solar particle event of Friday, July 14, 2000

September 24, 2012
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Influence of precipitating electrons on stratospheric ozone

September 24, 2012
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A Measurement of the Quiet-Time Geomagnetic Cutoff for Cosmic Rays at Space Station Latitudes

September 24, 2012
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SAMPEX measures Magnetospheric Response to High Speed Solar Wind Streams

September 24, 2012
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Deep Cutoff Suppression During the “Bastille Day” Event

September 24, 2012
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Long Term Measurements by SAMPEX Reveal Fascinating Features of Radiation Belts

September 24, 2012
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Acceleration mechanisms of energetic electrons in the Earth’s radiation belts

September 24, 2012
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