 |
| Titel |
The Sun Radio Imaging Space Experiment (SunRISE) Mission |
| VerfasserIn |
Joseph Lazio, Justin Kasper, Milan Maksimovic, Farah Alibay, Nikta Amiri, Tim Bastian, Christina Cohen, Enrico Landi, Ward Manchester, Alysha Reinard, Nathan Schwadron, Baptiste Cecconi, Gregg Hallinan, Alex Hegedus, Vratislav Krupar, Arnaud Zaslavsky |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250142012
|
| Publikation (Nr.) |
 EGU/EGU2017-5580.pdf |
|
|
|
|
|
| Zusammenfassung |
| Radio emission from coronal mass ejections (CMEs) is a direct tracer of particle
acceleration in the inner heliosphere and potential magnetic connections from the lower
solar corona to the larger heliosphere. Energized electrons excite Langmuir waves,
which then convert into intense radio emission at the local plasma frequency, with
the most intense acceleration thought to occur within 20 RS. The radio emission
from CMEs is quite strong such that only a relatively small number of antennas is
required to detect and map it, but many aspects of this particle acceleration and
transport remain poorly constrained. Ground-based arrays would be quite capable of
tracking the radio emission associated with CMEs, but absorption by the Earth’s
ionosphere limits the frequency coverage of ground-based arrays (ν ≳ 15 MHz),
which in turn limits the range of solar distances over which they can track the radio
emission (≲ 3RS). The state-of-the-art for tracking such emission from space is
defined by single antennas (Wind/WAVES, Stereo/SWAVES), in which the tracking is
accomplished by assuming a frequency-to-density mapping; there has been some success in
triangulating the emission between the spacecraft, but considerable uncertainties
remain.
We describe the Sun Radio Imaging Space Experiment (SunRISE) mission concept: A
constellation of small spacecraft in a geostationary graveyard orbit designed to localize and
track radio emissions in the inner heliosphere. Each spacecraft would carry a receiving
system for observations below 25 MHz, and SunRISE would produce the first images of
CMEs more than a few solar radii from the Sun.
Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of
Technology, under a contract with the National Aeronautics and Space Administration. |
|
|
|
|
|
|