Interplanetary Propagation of Type-III Solar Radio Bursts Associated with Near-Relativistic Electron Events

Details Interplanetary Propagation of Type-III Solar Radio Bursts Associated with Near-Relativistic Electron Events Interplanetary Propagation of Type-III Solar Radio Bursts Associated with Near-Relativistic Electron Events

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh41a..06h&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH41A-06

Physics

2144 Interstellar Gas, 7534 Radio Emissions, 7859 Transport Processes

Scientific paper

We have analyzed 125 interplanetary type III radio bursts detected between 25 KHz and 1 MHz by the WAVES/RAD1 experiment on Wind between 1997 and 2006. These events were selected for association with ACE/EPAM beam-like near-relativistic solar electron events. We have argued that these highly anisotropic near- relativistic electron events are well connected via the interplanetary magnetic field (IMF) to acceleration/release sites at the Sun. Consequently the associated type III events also should have good IMF connection to their release sites from the solar corona. We have made fits to the radius vs. time histories of the interplanetary type III bursts assuming that the solar wind electron density falls off inversely with radius squared. From linear fits to the leading edge of the high-resolution WAVES radio flux density, we found the apparent velocity (along an IMF spiral computed from the solar wind velocity at 1AU) of the leading edge of the type III bursts had a median value of 0.15c. We found that a significant fraction of the type III bursts were on field lines not passing directly through the Earth (confirmed by their emission frequencies remaining above the plasma frequency at Earth and the absence of associated <1keV low energy electrons). If we had assumed that the field lines containing the bursts had passed through the Earth, we would have deduced that the burst exciter was decelerating. However, once we allowed for that effect in our analysis, we found no evidence for interplanetary deceleration of the burst exciters. We then found that although ~75% of the bursts have an approximately constant speed, ~25% of the bursts were initially accelerating between the Sun and ~0.3 AU, consistent with a numerical simulation using statistical growth theory [Li et al, 2006].

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