Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997

Details Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997 Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..471...83l&link_type=abstract

The solar wind nine conference. AIP Conference Proceedings, Volume 471, pp. 83-86 (1999).

Physics

1

Scientific paper

By measuring the frequency drift rate of type III bursts observed continously from 13.8 MHz to a few kHz, we have derived the electron density distribution in the ecliptic plane, from the corona to 1 AU. This method is a powerful probe to explore the region between 1.8 Ro to 1 AU, most of which is not observed by coronographs. The observations were made by the radio experiment WAVES aboard the spacecraft Wind. We have selected type III bursts whose trajectories intersect the spacecraft, as determined by the presence of burst-associated Langmuir waves, or by energetic electrons observed by the 3-D Plasma experiment. For these bursts we are able to determine the mode of emission, the electron density at 1 AU, the distance of emission regions along the spiral, and the time spent by the beams as they proceed from the low corona to 1 AU. An average density model is derived, valid for solar minimum: ne=3.3×105r-2+4.1×106r-4+8.0×107r-6 cm-3, with r in units of Ro. We show how, for a given day, the density distribution departs from the average model. As an application, we derive the speed of the shock of 7 April 1997 which produced a type II burst from 75 to 0.9 MHz (1.2 to 13 Ro). For this event, a flare, a fast CME and the initiation of the type II burst occurred simultaneously to with in a few minutes. The derived speed of the type II shock in the solar wind leads to the arrival of the interplanetary shock at the Earth on 10 April at 1300 UT, as was observed.

Affiliated with

Also associated with

No associations

Rating

Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997 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 Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron density model from the corona to 1 AU and application to the type II burst of 7 April 1997 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1495768