Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm

Details Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh53a..08h&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SH53A-08

Physics

2151 Neutral Particles, 2164 Solar Wind Plasma, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

By 31 October 2003---the day after the SWICS instrument on ACE measured solar wind speeds peaking at ~2000 km/s for the second time in as many days---the solar wind had slowed to ~1000 km/s and the solar wind He thermal speed had dropped sharply from ~400 km/s to <10 km/s, indicating the presence of cold plasma near the Earth. From ~0545 to 0715 UT, while the IMAGE spacecraft was near or possibly within the magnetosheath, the LENA instrument detected neutral H over a 180° range, 50% wider than the typical angular extent. In three hours, from ~0330 to 0630 UT, the real-time Dst index recovered rapidly from -204 to -57 nT and the solar wind thermal speed increased from ~20 km/s to a maximum of ~50 km/s. Starting about two days earlier, the peak 2- to 6-MeV electron flux measured at SAMPEX moved in from L = ˜3.5 to ~2.5, filling the slot region. During this unique Halloween 2003 geomagnetic storm period we examine the influences the extreme solar wind states had on the magnetosphere. In particular, we focus on the energetic neutral atoms produced by the interaction between the shocked, heated, and redirected solar wind plasma of the magnetosheath and the neutral H atoms of the Earth's exosphere. When the magnetosphere is compressed, the ions in the magnetosheath have the potential to interact with denser layers of the exosphere, producing more neutrals through charge exchange. We investigate which factors---e.g., solar wind parameters, relative position of the spacecraft, geomagnetic indices, etc.---are primarily responsible for the unusual LENA measurements, and compare this event to less extreme time periods.

Affiliated with

Also associated with

No associations

Rating

Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energetic Neutral Atom Response to the Interaction Between the Solar Wind and the Dayside Magnetosphere During the Halloween 2003 Geomagnetic Storm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1179171