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Proposal Identification No.: A2980 Date Received: 2015­Mar­01 19:13:58
Technical Page
This proposal has not been submitted before.
Proposal Type: Regular
General Category: Astronomy
Sub­Category: Spectroscopy
Observation Category: Solar System
Total Time Requested: 31 Hours
Minimum Useful Time: full transits are needed
Proposal Title: CAN WE MEASURE MAGNETIZED ELECTRON DENSITY FLUCTUA­
TIONS IN MIRA­VARIABLE­STAR CORONAE?
ABSTRACT:
We have recently realized a technique for measuring electron density fluctuations in the Sun's corona and found
many interesting results, including: periodic fluctuations in electron column density; Coronal Mass Ejection (CME)
magnetized electron clouds; turbulent spectra; power transfer from circular to linear polarization. The technique
uses the propagation e#ects on a spacecraft downlink carrier. The goal of this proposal is to explore propagation
e#ects in the coronae of Mira variable stars, using the OH maser lines on the far side of the star (i.e., the
positive­velocity masers) as the signal. With their activity, Mira variables probably have much stronger
atmospheric e#ects than the Sun. The masers have similar crucial qualititiies as the spacecraft carrier: high
signal/noise, narrow lines, and polarization. This is completely unexplored territory in stars. If we are successful,
we may open up a new observational field---the exploration and characterization of physical con
Name Institution E­mail Phone Student
Carl Heiles university of califor­
nia at berkeley
heiles@astro.berkeley.edu 510 280 8099 no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
L­wide
Atmospheric Observation Instruments:
1

Special Equipment or setup: Mock spectrometers
RFI Considerations
Frequency Ranges Planned
This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST.
2