Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases

Details Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9517979g&link_type=abstract

Presented at the 30th Scientific Assembly, Hamburg, Germany, 11-24 Jul. 1994

Physics

Forbush Decreases, Heliosphere, Plasma Frequencies, Radio Emission, Shock Wave Interaction, Solar Wind, Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

Two intense heliospheric 2-3 kHz radio emission events have been observed by Voyager 1 and 2, the first in 1983-84 and the second in 1992-93. These radio emission events occurred about 400 days after large Forbush decreases in mid-1982 and mid-1991. Since Forbush decreases are indicative of a strong interplanetary shock propagating outward through the heliosphere, this temporal relationship provides strong evidence that the radio emissions are triggered by the interaction of a shock with one of the outer boundaries of the heliosphere. From the travel time and the known speed of the shock, the distance to the interaction region can be estimated and is well beyond 100 AU. At this great distance the plasma frequency at the terminal shock (100 to 200 Hz) is believed to be too small to explain the observed emission frequencies, which extend up to 3.6 kHz. For this reason, we have proposed that the interaction takes place at or near the heliopause, where remote sensing measurements show that the plasma frequency is in a suitable range (approximately 3 kHz) for explaining the radio emission. From the travel time and shock propagation speed, the radial distance to the heliopause has been calculated for various candidate solar events. After taking into account the likely deceleration of the shock, the heliopause is estimated to be in the range from about 110 to 160 AU.

Affiliated with

Also associated with

No associations

Rating

Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases 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 Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heliospheric 2-3 kHz radio emissions and their relationship to large Forbush decreases will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1073593